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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: u/wWD@,  
  z^y -A ?  
  一、实现方法 GkKoc v  
FY]Et= p  
  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: ~dLe9-_9  
?3i<^@?  
#pragma data_seg("shareddata") 5"+;}E|q  
HHOOK hHook =NULL; //钩子句柄 W;U<,g '  
UINT nHookCount =0; //挂接的程序数目 N'|9rB2e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g%D.sc)69  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 0 4oMgH>Vd  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5p/.( |b,  
static int KeyCount =0; L rV|Y~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "\M3||.!  
#pragma data_seg() s5X51#J#~  
SK_N|X].  
  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。 0,iG9D 7  
? :F Jc[J  
  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: SV^[)p )  
P%<MQg|k`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Ju.T.)H  
cKey,UCHAR cMask) P_gai7Xg  
{ 5o0H7k]  
 BOOL bAdded=FALSE; ^HHT>K-m  
 for(int index=0;index<MAX_KEY;index++){ 8P2_/)|  
  if(hCallWnd[index]==0){ :;Npk9P(N  
   hCallWnd[index]=hWnd; nrM-\'  
   HotKey[index]=cKey; fOk(ivYy  
   HotKeyMask[index]=cMask; |1T[P)Q  
   bAdded=TRUE; `|:` yl  
   KeyCount++; !T}R=;)e h  
   break; *4l6+#W  
  } "2T* w~V&y  
 } 0 Gq<APtr  
 return bAdded; &*~_ "WyU  
} AO8%!+"_  
//删除热键 T3-/+4$0v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1NK,:m  
{ mH'om SCz  
 BOOL bRemoved=FALSE; (]5gYi  
 for(int index=0;index<MAX_KEY;index++){ WTZuf9:  
  if(hCallWnd[index]==hWnd){ |s!n7%|,7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e^hI[LbNC  
    hCallWnd[index]=NULL; I3Ad+]v  
    HotKey[index]=0; Nm3CeU  
    HotKeyMask[index]=0; \r &(l1R  
    bRemoved=TRUE; cn'r BY  
    KeyCount--; XZ/cREz^s  
    break; Ul:M=8nE%  
   } >~T2MlRux  
  } MnptC 1N  
 } yeV|j\TJI.  
 return bRemoved; WX $AOnEv  
} ?nf4K/IjZ!  
MhN 8'y(  
?6:e%YT  
  DLL中的钩子函数如下: \Zn~y--Z  
Ystd[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hTQ]xN)  
{ ")W5`9  
 BOOL bProcessed=FALSE; y"ms;w'z  
 if(HC_ACTION==nCode) Oq 95zo  
 { r<"k /  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ul\FZT 4  
   switch(wParam) $u,`bX  
   {  *,wW-8  
    case VK_MENU: ~JOC8dO  
     MaskBits&=~ALTBIT; 8`q"] BQN  
     break; '^.3}N{Fo  
    case VK_CONTROL: 0Rh*SoYrC  
     MaskBits&=~CTRLBIT; z@xkE ,j>  
     break; u"kB`||(  
    case VK_SHIFT: i6E~]&~.v  
     MaskBits&=~SHIFTBIT;  ;.~D!  
     break; ' h|d-p\`9  
    default: //judge the key and send message =%+xNOdN7?  
     break; L#/<y{  
   } ^]$rh.7&  
   for(int index=0;index<MAX_KEY;index++){ ~|`jIqU  
    if(hCallWnd[index]==NULL) G\*`%B_ n  
     continue; 44UN*_qG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) n5?7iU&JIo  
    { prVqV-S6TY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;oRgg'k<  
     bProcessed=TRUE; ABhQ7 x|  
    } byJ[1UK  
   } ,h.hgyt  
  } IVG77+O# }  
  else if((lParam&0xc000ffff)==1){ //有键按下 vH]2t.\  
   switch(wParam) [uu<aRAg3O  
   { zB+zw\ncN  
    case VK_MENU: alZ83^YN'  
     MaskBits|=ALTBIT; YU1z\pK  
     break; f7 zGz  
    case VK_CONTROL: aOW$H:b  
     MaskBits|=CTRLBIT; 5K$d4KT  
     break; +kOXa^K  
    case VK_SHIFT: )'`@rq!  
     MaskBits|=SHIFTBIT; FX/f0C3CK  
     break; 7T=:dv  
    default: //judge the key and send message g|)yM^Vqr6  
     break; v79\(BX  
   } V"|j Dnn5  
   for(int index=0;index<MAX_KEY;index++){ v$R7"  
    if(hCallWnd[index]==NULL) xc$jG?83#  
     continue; wmit>69S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m?`$NJST  
    { YHo*IX')C?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =|q@ Q`DB  
     bProcessed=TRUE; C0'_bTfB  
    } D;X/7 p|>  
   } \xOv9(  
  } aX35^K /  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Mog!pmc{  
   for(int index=0;index<MAX_KEY;index++){ Y!_e ,]GW  
    if(hCallWnd[index]==NULL) i7xBi:Si  
     continue; Bet?]4\_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) EBplr ,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5f#]dgBe  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 DbK-3F_  
   } S{qsq\X  
  } r1|;V~ a$~  
 } 6 kAXE\T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); s!/Q>A  
} fMRMQR=6B  
UjS,<>fm  
  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: /@K1"/fqH  
lhJZPnx~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &y:SK)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /??nO Vvt  
+rOd0?  
  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: <0H^2ekd  
b'G!)n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =' #yG(h  
{ <z-+{-?z~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |&rxDf}W  
 { Np R&`]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bl v @u?  
  SaveBmp(); -<aN$O  
  return FALSE; v,,Dz8!Ty  
 } =BBDh`$R  
 …… //其它处理及默认处理  8=j_~&*  
} R}\n @X*  
z4*`K4W  
IHNl`\Le  
  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。 el^WBC3  
6?KJ"Ai9  
  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。 B}Sl1)E  
VY'1 $  
  二、编程步骤 *W=R:Bl!  
C2W&*W*  
  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"; 5KwT(R o  
%8T"h  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; UU]a).rz  
+[$ Q C*  
  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; vrvOPLiQ  
f;%\4TH?  
  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; DsF<P@O6  
ffS]%qa  
  5、 添加代码,编译运行程序。 Y'2 |GJc2  
Fs;_z9ej-u  
三、程序代码 yX|0 R H  
/FA0(< -}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KJN{p~Q  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ER*Et+ >  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ `'M}.q,k~  
#if _MSC_VER > 1000 S%k](\7!  
#pragma once 8zk?:?8%{  
#endif // _MSC_VER > 1000 B&c*KaK;~  
#ifndef __AFXWIN_H__ 44(l1xEN+  
#error include 'stdafx.h' before including this file for PCH \*6Ld %:h$  
#endif :sXn*k4v  
#include "resource.h" // main symbols uvj`r5ei  
class CHookApp : public CWinApp B]5G"4,  
{ ".T&nS[z  
 public: YCEdt>5PA  
  CHookApp(); (uskVK>L  
  // Overrides @If ^5s;z  
  // ClassWizard generated virtual function overrides 8^6dK  
  //{{AFX_VIRTUAL(CHookApp) ^K n{L  
 public: mA>u6Rlc  
  virtual BOOL InitInstance(); T_b$8GYfCY  
  virtual int ExitInstance(); Dg2=;)"L  
  //}}AFX_VIRTUAL z\ ?cazQ  
  //{{AFX_MSG(CHookApp) WEFvJ0]  
  // NOTE - the ClassWizard will add and remove member functions here. lq\/E`fc`  
  // DO NOT EDIT what you see in these blocks of generated code ! {9*k \d/;  
  //}}AFX_MSG 7Q3a0`Iq  
  DECLARE_MESSAGE_MAP() Fb9!x/$tGV  
}; 7!"OF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q\a'pp9d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _qQB.Dzo:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o$+"{3svw?  
BOOL InitHotkey(); 86N"EuH$  
BOOL UnInit(); !/Wp0E'A  
#endif or{X{_X7  
%>Y86>mVz  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P n|*(sTl  
#include "stdafx.h" beCTOmC  
#include "hook.h" }qOj^pkJ  
#include <windowsx.h> rkz_h  
#ifdef _DEBUG V[T`I a\  
#define new DEBUG_NEW UN6Du\)]d  
#undef THIS_FILE ]Uee!-dZ  
static char THIS_FILE[] = __FILE__; NRgNW1#  
#endif pv #uLo  
#define MAX_KEY 100 }tRY,f  
#define CTRLBIT 0x04 U$5 lh  
#define ALTBIT 0x02 WGeTL`}dh  
#define SHIFTBIT 0x01 z}:|is)?  
#pragma data_seg("shareddata") 1rmK#ld"=Z  
HHOOK hHook =NULL; m}dO\;  
UINT nHookCount =0; !R.*Vn[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =UW! 7OzC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT t^zmv PDK  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey dJ}E,rW}  
static int KeyCount =0; $Q cr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift DoA+Bwq@  
#pragma data_seg() 9dFSppM  
HINSTANCE hins; N ?mTAF'M  
void VerifyWindow(); KixS)sG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r|>a;n Y  
//{{AFX_MSG_MAP(CHookApp) YYc.e T<  
// NOTE - the ClassWizard will add and remove mapping macros here. b;XUv4~V  
// DO NOT EDIT what you see in these blocks of generated code! nR1QS_@{L  
//}}AFX_MSG_MAP Dtw1q-  
END_MESSAGE_MAP() -$js5 Gx1  
>u:t2DxE  
CHookApp::CHookApp() vhQIkB8  
{ Rg!Fu  
 // TODO: add construction code here, "\9!9U#!  
 // Place all significant initialization in InitInstance F qW[L>M'  
} vS{zLXg  
05cyWg9a  
CHookApp theApp; - s,M+Q(<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U3f a *D  
{ =6sL}$  
 BOOL bProcessed=FALSE; Pgg\(D#X`  
 if(HC_ACTION==nCode) |/R)FT#i  
 { 5}uH;E)4  
  if((lParam&0xc0000000)==0xc0000000){// Key up MWxv\o   
   switch(wParam) Mr3;B+S  
   { 9j;L-  
    case VK_MENU: "X }@VT=  
     MaskBits&=~ALTBIT; SXW8p>1Jw  
     break; (!@ Q\P  
    case VK_CONTROL: lnk`D(>W  
     MaskBits&=~CTRLBIT; bo  J  
     break; 5uU.K3G7  
    case VK_SHIFT: Ikn)XZU^  
     MaskBits&=~SHIFTBIT; z!r-g(^G  
     break; 7z=zJ4C  
    default: //judge the key and send message z"@yE*6  
     break; 9svnB@  
   } y.l`NTT] <  
   for(int index=0;index<MAX_KEY;index++){ [8o!X)  
    if(hCallWnd[index]==NULL) t)*MLg<C  
     continue; m6 )sX&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kt ILKpHt"  
    { lStYfO:<'v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B4 cm_YGE  
     bProcessed=TRUE; "|6#n34  
    } Wx<fD()  
   } ^" EsBt  
  } 2$MIA?A"Y  
  else if((lParam&0xc000ffff)==1){ //Key down f;u<r?>Z  
   switch(wParam) pS3TD"p  
   { MifPZQ  
    case VK_MENU: \[Dxg`;4  
     MaskBits|=ALTBIT; _ZnVQ,zY  
     break; x! A.**  
    case VK_CONTROL: %6vf~oG  
     MaskBits|=CTRLBIT; wm$1LZ8o-`  
     break; 8$H_:*A?  
    case VK_SHIFT: d3$&I==;:  
     MaskBits|=SHIFTBIT; YB^[HE\#y  
     break; gdu8O!9)  
    default: //judge the key and send message TfYXF`d  
     break; [=63xPxs.  
   } }T}9AQ}|  
   for(int index=0;index<MAX_KEY;index++) `Eijy3>h  
   { T w!]N%E  
    if(hCallWnd[index]==NULL) /WlpRf%  
     continue; !8Rsz:7^-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *h`%u8/{  
    { X5|<qu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @C]Q;>^|  
     bProcessed=TRUE; *<PQp   
    } $R'  
   } L|7F%oR  
  } Q!%4Iq%jr  
  if(!bProcessed){ "t-u=aDl-.  
   for(int index=0;index<MAX_KEY;index++){ uz(3ml^S  
    if(hCallWnd[index]==NULL) :jol Nl|a  
     continue; $rAHtr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XQW+6LEQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XF`,mV4  
   } 7g}lg8M  
  } '8Q:}{  
 } 8J P{`)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jb!R  
} v[r5!,F  
Kd?TIeFE  
BOOL InitHotkey() )}-,4Iu%  
{ &B</^:  
 if(hHook!=NULL){ S}/?L m}  
  nHookCount++; ;^q@w  
  return TRUE; *nv%~t   
 } 7gLN7_2  
 else : "|M  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1e 8J-Nkj  
  if(hHook!=NULL) T+OQa+E@P  
   nHookCount++; Vt {uG  
  return (hHook!=NULL); 'w?*4H  
} _%M5 T  
BOOL UnInit() 7fVlA"x  
{ hP=^JH  
 if(nHookCount>1){ _&Hq`KJm  
  nHookCount--; E^:8Jehq  
  return TRUE; ,X[l C\1a  
 } {&2a H> V/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h}X^  
 if(unhooked==TRUE){ ? 1OZEzA!  
  nHookCount=0; /B $9B  
  hHook=NULL; 2;Ij~~  
 } 2VrO8q(  
 return unhooked; 7q>Y)*V  
} Xndgs}zz  
mVg$z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _I$\O5  
{ ^ |k 7g  
 BOOL bAdded=FALSE; wj-=#gyAoo  
 for(int index=0;index<MAX_KEY;index++){ }9&Z#1/  
  if(hCallWnd[index]==0){ y"Fp4$qb  
   hCallWnd[index]=hWnd; 2yu\f u  
   HotKey[index]=cKey; _vQtV]  
   HotKeyMask[index]=cMask; %SG**7  
   bAdded=TRUE; z|w@eQ",  
   KeyCount++; dM%#DN8 l  
   break; F~;G [6}  
  } -6URM`y'j  
 } 2S~cW./#fX  
 return bAdded; t% -"h|  
} #kO.'oIl  
z=}@aX[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BT|5"b}  
{ Q>jx`68'KI  
 BOOL bRemoved=FALSE; 9] i$`y  
 for(int index=0;index<MAX_KEY;index++){ K.y2 $b/  
  if(hCallWnd[index]==hWnd){ C+, JLK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =J2\"6BnzA  
    hCallWnd[index]=NULL; T6gugDQ~.  
    HotKey[index]=0; }:5_vH0  
    HotKeyMask[index]=0; Pc+8CuN?  
    bRemoved=TRUE; mVJW"*}8  
    KeyCount--; 1o&] =(  
    break; IFrq\H0  
   } %\5 wHT+)  
  } 3#{{+5G  
 } 83 O+`f  
 return bRemoved; gnW]5#c@  
} c-|~ABtEpX  
8VbHZ9Q  
void VerifyWindow() AS 5\X.%L*  
{ X2X.&^  
 for(int i=0;i<MAX_KEY;i++){ 5H (CP  
  if(hCallWnd!=NULL){ dKs^Dq  
   if(!IsWindow(hCallWnd)){ C$9+p@G6  
    hCallWnd=NULL; ,QDS_u$xi&  
    HotKey=0; r-27AJu  
    HotKeyMask=0; LaI(  
    KeyCount--; Pm2T!0  
   } .T*K4m{b0  
  } :6~DOvY  
 } I%.96V  
} ~hubh!d=  
OQ[E-%v1 R  
BOOL CHookApp::InitInstance() t7A '  
{ KC+C?]~M  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qTbY'V5A  
 hins=AfxGetInstanceHandle(); 1ga-8&!  
 InitHotkey(); ]:lqbg[J  
 return CWinApp::InitInstance(); c,cc avv{I  
} t`PA85.|d  
~i`@  
int CHookApp::ExitInstance() u"rK5'  
{  tCT-cs  
 VerifyWindow(); -P|EV|8=  
 UnInit(); [x`trypg  
 return CWinApp::ExitInstance(); l[KFK%?  
} Y)?dq(  
"`b"PQ<x  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file I6bekOvP  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G8c 8`~t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Irk@#,{<  
#if _MSC_VER > 1000 HPc7Vo(  
#pragma once deD%E-Ja  
#endif // _MSC_VER > 1000 KfC8~{O-  
xM ]IU <  
class CCaptureDlg : public CDialog 4vri=P 2%  
{ q3+G  
 // Construction 2k\i/i/Y  
 public: 3j{VpacZY  
  BOOL bTray; ]1A"l!yf  
  BOOL bRegistered; #[.vfG  
  BOOL RegisterHotkey(); 'qGKS:8  
  UCHAR cKey; Y2&>;ym!  
  UCHAR cMask; )&G uZ  
  void DeleteIcon(); [ \I&/?On  
  void AddIcon(); f1c Q*#2~  
  UINT nCount; ]ne&`uO  
  void SaveBmp(); ;>*l?m-S@n  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <+MNv#1:w  
  // Dialog Data {@T8i ^EI  
  //{{AFX_DATA(CCaptureDlg) GCN(  
  enum { IDD = IDD_CAPTURE_DIALOG }; Qt+|s&HGt  
  CComboBox m_Key; ./_o+~\e'  
  BOOL m_bControl; yo)a_rY  
  BOOL m_bAlt; Of)EBa<5^  
  BOOL m_bShift; v 4@=>L  
  CString m_Path; 1<hj3  
  CString m_Number; 8&15k A  
  //}}AFX_DATA . &dh7` l  
  // ClassWizard generated virtual function overrides C4Pi6.wf  
  //{{AFX_VIRTUAL(CCaptureDlg) # 2As-9  
 public: aGK=VN}r  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Q>\y%&df  
 protected: HGuY-f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i^c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !olvP*c"  
  //}}AFX_VIRTUAL Yjv[rH5v  
  // Implementation f wN  
 protected: [4)q6N5`f  
  HICON m_hIcon; gTz66a@i  
  // Generated message map functions  &!I^m  
  //{{AFX_MSG(CCaptureDlg) xkv2#"*v  
  virtual BOOL OnInitDialog(); al/3$0#U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {}Y QB'}  
  afx_msg void OnPaint(); SHw%u~[hu  
  afx_msg HCURSOR OnQueryDragIcon(); sb 3l4(8g  
  virtual void OnCancel(); hg}Rh  
  afx_msg void OnAbout(); :e-&,K  
  afx_msg void OnBrowse(); EleK*l  
  afx_msg void OnChange(); <ex,@{n4  
 //}}AFX_MSG 1:-^*  
 DECLARE_MESSAGE_MAP() K`!q1 g`  
}; !^Mk5E(  
#endif I!(.tu6u6c  
TNs0^h)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [@Hv,  
#include "stdafx.h" auOYi<<>W  
#include "Capture.h" VKtrSY}6T  
#include "CaptureDlg.h" 8'=8!V  
#include <windowsx.h> @Q:5{?  
#pragma comment(lib,"hook.lib") 5t6!K?}  
#ifdef _DEBUG 5oz[Njq4  
#define new DEBUG_NEW 1tvgM !.  
#undef THIS_FILE '}a[9v76  
static char THIS_FILE[] = __FILE__; }s;W{Q  
#endif ># FO0R  
#define IDM_SHELL WM_USER+1 8l|v#^v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7 4rmxjiN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fM jn8.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S5eQHef  
class CAboutDlg : public CDialog zx7*Bnu0  
{ L@*0wx`fU  
 public: b*4[)Yg4  
  CAboutDlg(); F(E3U'G  
  // Dialog Data r!eCfV7  
  //{{AFX_DATA(CAboutDlg) 9moenkL  
  enum { IDD = IDD_ABOUTBOX }; TGxspmY6  
  //}}AFX_DATA ^H'zS3S  
  // ClassWizard generated virtual function overrides Ro+/=*ql~  
  //{{AFX_VIRTUAL(CAboutDlg) |]7z  
 protected: VFN\ Ryd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `r"euO r\  
  //}}AFX_VIRTUAL 846j<fE  
  // Implementation cnAwoTt4  
 protected: 'U<-w$!f+^  
  //{{AFX_MSG(CAboutDlg) mk JS_6  
  //}}AFX_MSG &&e{9{R  
  DECLARE_MESSAGE_MAP() EK:!.Fl  
}; ?9qA"5  
J~z;sTR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7)zn[4v7qt  
{ ]Xcqf9k  
 //{{AFX_DATA_INIT(CAboutDlg) "rz|sbj  
 //}}AFX_DATA_INIT y}jX/Ln  
} Va"_.8n|+  
H27J kZ&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zuOx@T^  
{ ?'H);ou-p  
 CDialog::DoDataExchange(pDX);  /kGRN @  
 //{{AFX_DATA_MAP(CAboutDlg) ^n5[pF}Gw  
 //}}AFX_DATA_MAP M70Xdn  
} A:3bL: ;t  
+O23@G?x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) '>(R'g42n  
 //{{AFX_MSG_MAP(CAboutDlg) fRo_rj _  
 // No message handlers t5h]]TOz  
 //}}AFX_MSG_MAP ['pk/h  
END_MESSAGE_MAP() X<s']C9c  
2-821Sf#h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \(_FGa4j  
: CDialog(CCaptureDlg::IDD, pParent) w5"C<5^  
{ @YyTXg{ZK  
 //{{AFX_DATA_INIT(CCaptureDlg) gO-C[j/  
  m_bControl = FALSE; 't=\YFQ*v  
  m_bAlt = FALSE; hvu>P {  
  m_bShift = FALSE; H`4H(KWm  
  m_Path = _T("c:\\"); gkUG*Zw  
  m_Number = _T("0 picture captured."); }9fH`C/m  
  nCount=0; gH- e0134%  
  bRegistered=FALSE; DB'pRo+U  
  bTray=FALSE; }J t( H  
 //}}AFX_DATA_INIT 4cK6B)X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 UJkg|eu  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z~o*$tF/  
} )AOD~T4s7  
!Y_"q^5GG'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TDg#O!DUF  
{ }~dXz?{p8  
 CDialog::DoDataExchange(pDX); ' >[KVvm  
 //{{AFX_DATA_MAP(CCaptureDlg) Mn+;3qo{6  
  DDX_Control(pDX, IDC_KEY, m_Key); BDY@&vF  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mg)lr&-b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1E!0N`E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -}k'a{sj=  
  DDX_Text(pDX, IDC_PATH, m_Path); Ee>P*7*jB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 0j%@P[zQ  
 //}}AFX_DATA_MAP ZjLzS]\a  
} sqHv rI  
e47JLW&b  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) le`&VdE^  
//{{AFX_MSG_MAP(CCaptureDlg) ((rk)Q+;v  
 ON_WM_SYSCOMMAND() /=4P< &J  
 ON_WM_PAINT() +v%V1lf^~  
 ON_WM_QUERYDRAGICON() z^9Yoqog  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MJ[#Gq\0R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) th8f  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P%>? O :a  
//}}AFX_MSG_MAP Y4`MgP8t  
END_MESSAGE_MAP() NLM ]KT  
ay#cW.,  
BOOL CCaptureDlg::OnInitDialog() -bo2"*|m  
{ NtMK+y  
 CDialog::OnInitDialog(); ws5x53K  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &NV[)6!  
 ASSERT(IDM_ABOUTBOX < 0xF000); (5?5? <  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Okca6=2"  
 if (pSysMenu != NULL) (A?{6  
 { #"d.D7nA  
  CString strAboutMenu; d -6[\S#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); w3:WvA5jt  
  if (!strAboutMenu.IsEmpty()) DHGv< F@  
  { ZC3b9:tk  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4*OL^ \%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); vOsd>3"  
  } cs`/^2Vf"#  
 } xEaRuH c  
 SetIcon(m_hIcon, TRUE); // Set big icon i7 `dY {p7  
 SetIcon(m_hIcon, FALSE); // Set small icon 94%gg0azp  
 m_Key.SetCurSel(0); j~V@0z.  
 RegisterHotkey(); w.J[3m/  
 CMenu* pMenu=GetSystemMenu(FALSE); (utm+*V,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hu\HK81m  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); bJe*J\){  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~c[} %Ir>  
 return TRUE; // return TRUE unless you set the focus to a control _Jj/"?  
} qie7iE`o  
AY:3o3M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8 f%@:}H  
{ ` 1DJwe2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2;%DE<Z  
 { )F&@ M;2p'  
  CAboutDlg dlgAbout; _:0<]<x?  
  dlgAbout.DoModal();  }5bh,'  
 } {rGq|Bj  
 else Vn? %w~0!  
 { )eGGA6G  
  CDialog::OnSysCommand(nID, lParam); }GsZ)\!$4  
 } -h*Yd)  
} r9@O`i  
B?-RzWB\3  
void CCaptureDlg::OnPaint() @/yRE^c  
{ lDV8<  
 if (IsIconic()) g^8dDY[%  
 { %([$v6y  
  CPaintDC dc(this); // device context for painting OYC4iI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); JU:!lyd  
  // Center icon in client rectangle WKX5Dl  
  int cxIcon = GetSystemMetrics(SM_CXICON); #})Oz| c  
  int cyIcon = GetSystemMetrics(SM_CYICON); $-"AMZ899  
  CRect rect; :ORCsl6-  
  GetClientRect(&rect); sF]v$ kq  
  int x = (rect.Width() - cxIcon + 1) / 2; y?<[g;MuT  
  int y = (rect.Height() - cyIcon + 1) / 2; VgZ<T,SuW  
  // Draw the icon Gk,{{:M:5  
  dc.DrawIcon(x, y, m_hIcon); MLY19;e  
 } M$-4.+G  
 else hxx,E>k  
 { _`/0/69  
  CDialog::OnPaint(); wQ!~c2a<8  
 } ~w Dmt  
} 2ko7t9y&  
tu77Sb  
HCURSOR CCaptureDlg::OnQueryDragIcon() \8Mkb]QA  
{ N<hbV0$%  
 return (HCURSOR) m_hIcon; 3XY$w&f  
} w(r$n|Ks9  
SDiZOypS  
void CCaptureDlg::OnCancel() xC`Hm?kM  
{ jM1_+Lm1  
 if(bTray) EVNTn`J_  
  DeleteIcon(); B+);y  
  CDialog::OnCancel(); p\:_E+lsU  
} "*laY<E  
D/V. o}X$  
void CCaptureDlg::OnAbout() *)ed(+b  
{ J:f>/  
 CAboutDlg dlg; V|}9d:&O  
 dlg.DoModal(); :tdx:  
} t2p/NIn  
]~8bh*,=  
void CCaptureDlg::OnBrowse() >?'q P ]  
{  g}Hk4+  
 CString str; tzi+A;>c(v  
 BROWSEINFO bi; WRh&4[G'  
 char name[MAX_PATH]; &[*_ -  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X~0l1 @!  
 bi.hwndOwner=GetSafeHwnd(); |/arxb&  
 bi.pszDisplayName=name; aen(Mcd3bg  
 bi.lpszTitle="Select folder"; 8jqt=}b  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pW:h\}%`n  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jCW>=1:JGY  
 if(idl==NULL) (&PamsV*8  
  return; 10}oaL S  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); PZNo.0M70  
 str.ReleaseBuffer(); vbqI$F[s  
 m_Path=str; k}ps-w6:  
 if(str.GetAt(str.GetLength()-1)!='\\') - c<<A.X  
  m_Path+="\\"; @M#2T  
 UpdateData(FALSE); D> Z>4:EM  
} $DA0lY\  
@[=*w`1  
void CCaptureDlg::SaveBmp() Q[J,j+f<  
{ M42Zpb].  
 CDC dc; a[";K,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); huvg'Y t  
 CBitmap bm; -/x +M-X#  
 int Width=GetSystemMetrics(SM_CXSCREEN); H4l:L(!D  
 int Height=GetSystemMetrics(SM_CYSCREEN); bw%1*;n)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )FWF T:P~  
 CDC tdc; dadOjl)S)  
 tdc.CreateCompatibleDC(&dc); aU^>kRGc  
 CBitmap*pOld=tdc.SelectObject(&bm); /T#<g:   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x)"=*Jj  
 tdc.SelectObject(pOld); 6i.'S5.  
 BITMAP btm; 6 $ IXER  
 bm.GetBitmap(&btm); t vk^L3=<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; JsnavI6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bIp;$ZHy`K  
 BITMAPINFOHEADER bih; `6~*kCj5  
 bih.biBitCount=btm.bmBitsPixel; #Yw^n?~~  
 bih.biClrImportant=0; d/Py,  
 bih.biClrUsed=0; ,EZ&n[%Ko  
 bih.biCompression=0; b cM#KA  
 bih.biHeight=btm.bmHeight; *Z{$0K  
 bih.biPlanes=1; 1"/V?ArfL  
 bih.biSize=sizeof(BITMAPINFOHEADER); + A0@# :B  
 bih.biSizeImage=size; KG>.7xVWV7  
 bih.biWidth=btm.bmWidth; !Q.c8GRUQ  
 bih.biXPelsPerMeter=0; V.y+u7<3}  
 bih.biYPelsPerMeter=0; W3<O+S&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KNY<"b  
 static int filecount=0; 0p2 0Rt  
 CString name; zNE!m:s  
 name.Format("pict%04d.bmp",filecount++); yqejd_cd  
 name=m_Path+name; 'Dat.@j  
 BITMAPFILEHEADER bfh; LWVO%@)w  
 bfh.bfReserved1=bfh.bfReserved2=0; #H!~:Xu   
 bfh.bfType=((WORD)('M'<< 8)|'B'); I,YGm  
 bfh.bfSize=54+size; <(f4#B P  
 bfh.bfOffBits=54; 4 T^M@+&|  
 CFile bf; jQb=N%5s  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ IC}zgvcW  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); LrPDpTd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); GC4$9q}C4Z  
  bf.WriteHuge(lpData,size); JYSw!!eC  
  bf.Close(); FblGFm"P  
  nCount++; :[ITjkhde0  
 } n|,Es!8:o  
 GlobalFreePtr(lpData); MO _9Yi  
 if(nCount==1) 8z/^Ql  
  m_Number.Format("%d picture captured.",nCount); d\)v62P  
 else ]ei] ) JI  
  m_Number.Format("%d pictures captured.",nCount); G x,D'H'  
  UpdateData(FALSE); 1c}'o*K_%  
} nn=JM7e\9  
{;p /V\   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 8ZIv:nO$  
{ iGhapD  
 if(pMsg -> message == WM_KEYDOWN) M2s   
 { `Mjm/9+18  
  if(pMsg -> wParam == VK_ESCAPE) SQ.4IWT(hR  
   return TRUE; 0I#<-9&d-  
  if(pMsg -> wParam == VK_RETURN) Ce0I8B2y  
   return TRUE; I* bjE '  
 } 61mQJHl.  
 return CDialog::PreTranslateMessage(pMsg); N$y4>g  
}  >#q|Pjv]  
~(Tz <  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S;t~"87v*  
{ +?.,pqn<=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3YLnh@-  
  SaveBmp(); Fj]S8wI  
  return FALSE; 78.sf{I  
} <5X@r#Lz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;8T<L[ ^U  
 CMenu pop; .1pEq~>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zu^ AkMc  
 CMenu*pMenu=pop.GetSubMenu(0); $< aBawLZO  
 pMenu->SetDefaultItem(ID_EXITICON); "|Pl(HX  
 CPoint pt; /C(L(X  
 GetCursorPos(&pt); xJ"KR:CD>  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {[s<\<~B*  
 if(id==ID_EXITICON) sW]n~kTt'  
  DeleteIcon(); N!m%~},s//  
 else if(id==ID_EXIT) V`H#|8\i  
  OnCancel(); {$EXI]f  
 return FALSE; I}q-J~s  
} #E ~FF@a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r]E$uq bR  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) c3}}cFe  
 AddIcon(); w1}[lq@  
 return res; )F~_KD)7jJ  
} |.S;z"v![  
[%@zH  
void CCaptureDlg::AddIcon() n-=\n6"P  
{ $bo^UYZ6  
 NOTIFYICONDATA data; ^s?wnEo;j  
 data.cbSize=sizeof(NOTIFYICONDATA); O[`Ob6Q{F  
 CString tip; l~=iUZW<  
 tip.LoadString(IDS_ICONTIP); :rj78_e9  
 data.hIcon=GetIcon(0); 7'8O*EoB'  
 data.hWnd=GetSafeHwnd(); -m @s 9k  
 strcpy(data.szTip,tip); 1]<!Xuk^f  
 data.uCallbackMessage=IDM_SHELL; 9F-k:hD |  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x)?\g{JH  
 data.uID=98; ms{R|vU%b  
 Shell_NotifyIcon(NIM_ADD,&data); oF>GWst TR  
 ShowWindow(SW_HIDE); E??%)q  
 bTray=TRUE; C=]3NB>Jc  
} =;`YtOL  
#<~f~{x  
void CCaptureDlg::DeleteIcon() F9<OKcXH  
{ Ya_6Zd4O  
 NOTIFYICONDATA data; roA1= G\Q  
 data.cbSize=sizeof(NOTIFYICONDATA); .( J /*H  
 data.hWnd=GetSafeHwnd(); 3K{8sFDO  
 data.uID=98; g}D$`Nx:  
 Shell_NotifyIcon(NIM_DELETE,&data); K@i*Nl  
 ShowWindow(SW_SHOW); 0l##M06>  
 SetForegroundWindow(); aE%VH ;?  
 ShowWindow(SW_SHOWNORMAL); q)~qd$yMS  
 bTray=FALSE; ##5/%#eZ  
} O`u!P\  
6a@~;!GlI  
void CCaptureDlg::OnChange() BNy"YK$  
{ 4W?<hv+k7*  
 RegisterHotkey(); WAa?$"U2  
} Y; w]u_  
} -vBRY  
BOOL CCaptureDlg::RegisterHotkey() nT12[@:Tr  
{ r#Mx~Zg~  
 UpdateData(); W<4\4  
 UCHAR mask=0; 42u\Y_^ID  
 UCHAR key=0; md`ToU  
 if(m_bControl) ]/bE${W*]  
  mask|=4; i#lo? \PO>  
 if(m_bAlt) HZm i ?  
  mask|=2; X2`>@GR/>  
 if(m_bShift) g@2.A;N0  
  mask|=1; Z]Y4NO;  
  key=Key_Table[m_Key.GetCurSel()]; `#f=&S?k  
 if(bRegistered){ caP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |z'?3?,~  
  bRegistered=FALSE; j+9 S  
 } m\f_u*  
 cMask=mask; (*ng$z Z$  
 cKey=key; V\"5<>+O  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [!le 9aNg  
 return bRegistered; jE#8&P~  
} CwvNxH#LVu  
w b[(_@eZ  
  四、小结 k)s 7Ev*  
78)^vvn5~  
  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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