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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: A"b31*_  
  <af# C2`B  
  一、实现方法 ;2`6eyr  
h?SRX_  
  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: fTy:Re  
l5 H5!$3~  
#pragma data_seg("shareddata") +)q ,4+K%}  
HHOOK hHook =NULL; //钩子句柄 @#,/6s7?  
UINT nHookCount =0; //挂接的程序数目 FD 8Lk  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1[Yl8W%pj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 67Pmnad  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }O@>:?U  
static int KeyCount =0; GyQFR?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /K&9c !]$C  
#pragma data_seg() Q?>r:vMi  
e3CFW_p  
  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。 n)q8y0if  
0:[A4S`X  
  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: 0/f|ZH ~!  
2ak]&ll+h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k $^/$N  
cKey,UCHAR cMask) T2w4D !  
{ Q34u>VkdQI  
 BOOL bAdded=FALSE; gF)-Ci  
 for(int index=0;index<MAX_KEY;index++){ V>)/z|[  
  if(hCallWnd[index]==0){ MSM8wYcD  
   hCallWnd[index]=hWnd; B;=Z^$%T  
   HotKey[index]=cKey; ~%>i lWaHB  
   HotKeyMask[index]=cMask; *'8q?R?7g  
   bAdded=TRUE; ~\NQkaBkY  
   KeyCount++; |Vz)!M  
   break; ]`x+wWe  
  } q`2dL)E  
 } \os"w "  
 return bAdded; 3<$Ek3X  
} "]]LQb$  
//删除热键 )yig=nn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /fT"WaTEK  
{ M]{~T7n-  
 BOOL bRemoved=FALSE; p!:oT1U  
 for(int index=0;index<MAX_KEY;index++){ :~8@fEKb{  
  if(hCallWnd[index]==hWnd){ Wgte.K> /  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1DcBF@3sWG  
    hCallWnd[index]=NULL; Q}B]b-c+E  
    HotKey[index]=0; QEt"T7a[/  
    HotKeyMask[index]=0; (jU_lsG  
    bRemoved=TRUE; UwS7B~  
    KeyCount--; )GG9[%H!  
    break; xgIb6<qwY  
   } aIa<,  
  } '1 2*'Q+{+  
 } =L#&`s@)_  
 return bRemoved; tP! %(+V  
} 5Q8 H8!^  
KM[0aXOtv  
d38o*+JCf  
  DLL中的钩子函数如下: AH'c:w]~  
!zOj`lx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )HE{`yiLL  
{ &K'*67h  
 BOOL bProcessed=FALSE; lJFy(^KQG,  
 if(HC_ACTION==nCode) w>X@ ,  
 { i,;eW&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z-gMk@l  
   switch(wParam) d6tv4Cf  
   {  )Hin{~h  
    case VK_MENU: rMIX{K)'f  
     MaskBits&=~ALTBIT; 3;Yd"  
     break; qdpi-*2  
    case VK_CONTROL: 3)W_^6>bM  
     MaskBits&=~CTRLBIT; HJg&fkHn1  
     break; |^5"-3Q  
    case VK_SHIFT: BrSvkce  
     MaskBits&=~SHIFTBIT; C=&n1/  
     break; NYHK>u/5c  
    default: //judge the key and send message P A ZjA0d  
     break; g4,ldr"D  
   } 8=Oym~  
   for(int index=0;index<MAX_KEY;index++){ n^{h@u  
    if(hCallWnd[index]==NULL) n5"oXpcIx  
     continue; J7",fb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Yu" Q  
    { oCkG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ow>u!P!  
     bProcessed=TRUE; K5LJx-x*j  
    } diu"Nt  
   } pEcYfj3M  
  } 2C:u)}R7D  
  else if((lParam&0xc000ffff)==1){ //有键按下 r{r~!=u  
   switch(wParam) xP>cQELot  
   { GNM>hQ)h:  
    case VK_MENU: zT)cg$8%fY  
     MaskBits|=ALTBIT; .>TG{>sH  
     break; T8g\_m  
    case VK_CONTROL: Ot47.z  
     MaskBits|=CTRLBIT; O6?{@l  
     break; IYq#|^)5+  
    case VK_SHIFT: R3og]=uFzm  
     MaskBits|=SHIFTBIT; AC <2.i_  
     break; %.`u2'^  
    default: //judge the key and send message a_S`$(7k  
     break; /77cjesZ9  
   } S[$9_Jf  
   for(int index=0;index<MAX_KEY;index++){ <S7SH-{_\  
    if(hCallWnd[index]==NULL) j$_?g!I=gK  
     continue; ^cPVnl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lbt8S.fx  
    { D1-w>Y#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]s5e[iS  
     bProcessed=TRUE; !4+Die X  
    } m_Ed[h/I  
   } ^GM3nx$  
  } 3,v/zcV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 m4OnRZYlw  
   for(int index=0;index<MAX_KEY;index++){ N}VoO0I  
    if(hCallWnd[index]==NULL) 53aJnxX  
     continue; q['D?)sy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {9Qc\Ij  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -6-rX D  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ww8U{f  
   } T'7>4MT(  
  } jEQ_#KKYJ  
 } [I%e Ro[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W^^0Rh_  
} #y#TEw,  
X1P1 $RdkR  
  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: 4.,|vtp  
l]&A5tz3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 $%#n*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,2Ed^!`  
ZG H 7_K  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: FLQke"6i0:  
~.^:?yCA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m=E/um[D  
{ Xlug{ Uh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vgtAJp+p*  
 { ;sYDs71y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AaB1H7r-  
  SaveBmp(); ul N1z  
  return FALSE; 1t/c@YUTy  
 } xzY/$?  
 …… //其它处理及默认处理  y_[VhZ%  
} $~:ZzZO  
cu5}(  
sx+k V A  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 '=+N )O  
:,p3&2 I  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 P]}:E+E<.I  
J|U~W kW  
  二、编程步骤 {}'Jr1  
YY tVp_)  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]5 ]wyDj  
rusM]Z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _Fj\0S"  
n7ZJ< ~wl  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; rT;l#<#VE  
Z-CA9&4Uh  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; -6_<]  
>clVV6B  
  5、 添加代码,编译运行程序。 )cQ KR4x0^  
8Wtr,%82  
三、程序代码 fl4@5AVY  
R=Lkf  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |QbCFihn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) l8+1{6xP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ . &}x[~g  
#if _MSC_VER > 1000 J:uFQWxZ   
#pragma once )N^fSenFBn  
#endif // _MSC_VER > 1000 c{D<+XM  
#ifndef __AFXWIN_H__ ^|h_[>  
#error include 'stdafx.h' before including this file for PCH 2.);OFk+  
#endif 7?k3jDK  
#include "resource.h" // main symbols MTE 1\,  
class CHookApp : public CWinApp 1=+S'_j  
{ I31Nu{  
 public: D?Ol)aj?  
  CHookApp(); h8.(Q`tli  
  // Overrides 0 nI*9  
  // ClassWizard generated virtual function overrides `3[W~Cq  
  //{{AFX_VIRTUAL(CHookApp) {7IZN< e  
 public: {be|G^.c  
  virtual BOOL InitInstance(); \hlS?uD\  
  virtual int ExitInstance(); TGG=9a]m  
  //}}AFX_VIRTUAL  K\ pZ  
  //{{AFX_MSG(CHookApp) A9Ea}v9:  
  // NOTE - the ClassWizard will add and remove member functions here. 7w5l[a/  
  // DO NOT EDIT what you see in these blocks of generated code ! /P[u vO  
  //}}AFX_MSG ; 1?L  
  DECLARE_MESSAGE_MAP() yP-$@Ry  
}; .aWwJZ=[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &u"mFweS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $@{ d\@U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 90J WU$K  
BOOL InitHotkey(); fRk'\jzT  
BOOL UnInit(); %ByqkY{5F  
#endif DD7D&@As  
AxJqLSfyb,  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. HWou&<EK  
#include "stdafx.h" OS L~a_  
#include "hook.h" U[yA`7Zs}  
#include <windowsx.h> ~QE?GL   
#ifdef _DEBUG {Ho_U&<  
#define new DEBUG_NEW x`wUi*G  
#undef THIS_FILE 7PfNPz<4+  
static char THIS_FILE[] = __FILE__; a&mL Dh/  
#endif [UdJ(cGf  
#define MAX_KEY 100 t]3:vp5N]  
#define CTRLBIT 0x04 3,#qt}8`  
#define ALTBIT 0x02 `7`` 1TL  
#define SHIFTBIT 0x01 _q-k1$ o$  
#pragma data_seg("shareddata") 4yMi9Ri4H  
HHOOK hHook =NULL; 5``usn/&Kj  
UINT nHookCount =0; vsA/iH.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Q}lY1LT`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d"ZsOq10D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,HE{&p2y  
static int KeyCount =0; f0g_Gn $  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <[gN4x>'  
#pragma data_seg() 8&x&Ou$("V  
HINSTANCE hins; <Z1m9O "sy  
void VerifyWindow(); - t 4F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6I]{cm   
//{{AFX_MSG_MAP(CHookApp) }ew )QHd  
// NOTE - the ClassWizard will add and remove mapping macros here. ,*L3  
// DO NOT EDIT what you see in these blocks of generated code! _!vuDv%  
//}}AFX_MSG_MAP 9j;!4AJ1t  
END_MESSAGE_MAP() *gwo.s  
X"f]  
CHookApp::CHookApp() h^H)p`[Gme  
{ A}uWy^w  
 // TODO: add construction code here, #x6w M~  
 // Place all significant initialization in InitInstance X*)DpbWd  
} :9>U+)%  
Oeg^%Y   
CHookApp theApp; .nA9irc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZS&+<kGD  
{ .q 4FGPWz  
 BOOL bProcessed=FALSE; (G>g0(;D-  
 if(HC_ACTION==nCode) j->5%y  
 { (r.y   
  if((lParam&0xc0000000)==0xc0000000){// Key up -ebyW#  
   switch(wParam) j3?@p5E(  
   { T!&VT;   
    case VK_MENU: PC,I"l  
     MaskBits&=~ALTBIT; |mw3v>  
     break; oBPm^ob4  
    case VK_CONTROL: w0.;86<MV  
     MaskBits&=~CTRLBIT; y?*Y=,"  
     break; p{0rHu[  
    case VK_SHIFT: cGg ~+R2P  
     MaskBits&=~SHIFTBIT; m$'ZiS5  
     break; p@YbIn  
    default: //judge the key and send message QcdAg%"yy  
     break; .g_Kab3?L  
   } eN  TKX  
   for(int index=0;index<MAX_KEY;index++){ {I$zmVG  
    if(hCallWnd[index]==NULL) y&F&Z3t  
     continue; PC?XE8o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2) Q/cH\g  
    { Qyj:!-o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y 5Kr<cF^  
     bProcessed=TRUE; vF{{$)c  
    } KW36nY\7  
   } ph7]*W-  
  } a0wpsl iF  
  else if((lParam&0xc000ffff)==1){ //Key down )*BG-nM u  
   switch(wParam) jpiBHi]5+  
   { EBUCG"e  
    case VK_MENU: Q\le3KB  
     MaskBits|=ALTBIT; NrcxuItkYn  
     break; t8#u}u  
    case VK_CONTROL: al]-*=v7}  
     MaskBits|=CTRLBIT; Cj6$W5I m  
     break; EHq?yj;  
    case VK_SHIFT: >\1j`/ :ZI  
     MaskBits|=SHIFTBIT; W_]onq 6  
     break; [Al} GM  
    default: //judge the key and send message {k<mN Y  
     break; > a8'MK  
   } H$3:Ra+ S  
   for(int index=0;index<MAX_KEY;index++) 7Rr +Uzb(  
   { jxgs!B>   
    if(hCallWnd[index]==NULL) ?$H=n{iW  
     continue; $viZ[Lu!m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yzL6oU-{&  
    { u5P2*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Gl>*e|}  
     bProcessed=TRUE; j@jUuYuDgl  
    } &UX:KW`=  
   } Vfr.Yoy  
  } FlLk.+!t  
  if(!bProcessed){ t\,X G  
   for(int index=0;index<MAX_KEY;index++){ $_W kI^  
    if(hCallWnd[index]==NULL) =i Wn T  
     continue; wvEdZGO8!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :T/I%|;f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _Qf310oONS  
   } Y$eO:67;  
  } lMb&F[KJ7  
 } SOJkeN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mA\}zLw+r9  
} C.=[K_  
pb|,rLNZ  
BOOL InitHotkey() /E5>cqX4A  
{ 6Iv &c2  
 if(hHook!=NULL){ ZcrFzi  
  nHookCount++; 3m/XT"D  
  return TRUE; /,^AG2]( f  
 } k:`yxxYIh  
 else /baSAoh/e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 67P@YL  
  if(hHook!=NULL) ~:"//%M3l  
   nHookCount++; KyRcZ"  
  return (hHook!=NULL); /qPhptV  
} ^qNr<Ye  
BOOL UnInit() *skmTioj&  
{ +(8Z8]Jf  
 if(nHookCount>1){ M:.0]'[s5  
  nHookCount--; t``q_!s}F  
  return TRUE; "VQ7Y`,+  
 } @`:z$52  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7SJtW`~  
 if(unhooked==TRUE){ 3|1v)E  
  nHookCount=0; h9l 6AnbJ  
  hHook=NULL; [|APMMYK1  
 } \) g?mj^  
 return unhooked; cFloaCz  
} 9<1dps=c  
q3/ 0xN+?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Xny{8Oo<1?  
{ '>#8 F.  
 BOOL bAdded=FALSE; :$&v4IW  
 for(int index=0;index<MAX_KEY;index++){ c#`&uLp  
  if(hCallWnd[index]==0){ R2f^dt^  
   hCallWnd[index]=hWnd; sH+ 90|?  
   HotKey[index]=cKey; Ws:MbZyr  
   HotKeyMask[index]=cMask; G9r~O#=gy  
   bAdded=TRUE; I*l y 7z  
   KeyCount++; R b=q #  
   break; k[]2S8K2  
  } ix_&<?8  
 } DAx 1  
 return bAdded; |sPUb;&~  
} v1\/dQK  
C?t!Uvs  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^_G@a,  
{ gE~LPwM  
 BOOL bRemoved=FALSE; ow K)]t  
 for(int index=0;index<MAX_KEY;index++){ `-w;/A"MJ  
  if(hCallWnd[index]==hWnd){ `]wk)50BVp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b_a6|  
    hCallWnd[index]=NULL; F%G} >xn  
    HotKey[index]=0; ^.@F1k  
    HotKeyMask[index]=0; kJ.0|l0  
    bRemoved=TRUE; I@:"Qee  
    KeyCount--; -$cO0RSY  
    break; 5O"$'iL  
   } w7QYWf'  
  } o&#!W(   
 } E{{Kz r2$  
 return bRemoved; i@#=Rxp  
} =&roL7ps  
t-)d*|2n}o  
void VerifyWindow() ygYy [IZ  
{ J)P7QTC  
 for(int i=0;i<MAX_KEY;i++){ QeG3X+  
  if(hCallWnd!=NULL){ ?OVje9  
   if(!IsWindow(hCallWnd)){ Gm-V/[29R  
    hCallWnd=NULL; z^\-x9vL  
    HotKey=0; CX#d9 8\b  
    HotKeyMask=0; 7(C:ty9  
    KeyCount--; #X qnH  
   } HlraOp+  
  } 9i+`,r  
 } q0VR&b`?>D  
} QfRo`l/V9  
63Z^ k(  
BOOL CHookApp::InitInstance() !AN;  
{ #N;McF;W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lwm 9gka  
 hins=AfxGetInstanceHandle(); Y |9  
 InitHotkey(); 8\Hz FB  
 return CWinApp::InitInstance(); D4$2'h  
} v:]z-zU  
I*H($ a  
int CHookApp::ExitInstance() QVo>Uit   
{ 2&XNT-Qm  
 VerifyWindow(); Tb}op XYK  
 UnInit(); 1G )I|v9R  
 return CWinApp::ExitInstance(); w/csLi.O  
} 2 :wgt  
4OFv#$[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -9(pOwN |m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kbZpi`w  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ . Ky)Co  
#if _MSC_VER > 1000 L wn  
#pragma once "D'"uMS`H  
#endif // _MSC_VER > 1000 vL8Rg} Jh4  
iAZbh"I  
class CCaptureDlg : public CDialog sq?js#C5  
{ S ^$!n,  
 // Construction JJy.)-R  
 public: `\J,%J  
  BOOL bTray; P~s u]+  
  BOOL bRegistered; zJov*^T-C  
  BOOL RegisterHotkey(); yX/{eX5dr  
  UCHAR cKey; $N\k*=  
  UCHAR cMask; 8&yI1XM|  
  void DeleteIcon(); UT0}Ce>e  
  void AddIcon(); (#8B  
  UINT nCount; z0@BBXQ`  
  void SaveBmp(); fNz(z\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor -^q;e]+J  
  // Dialog Data gFl@A}  
  //{{AFX_DATA(CCaptureDlg) @D>qo=KPM  
  enum { IDD = IDD_CAPTURE_DIALOG }; I>{o]^xw-D  
  CComboBox m_Key; 3:T~$M`]  
  BOOL m_bControl; 934@Z(aUH  
  BOOL m_bAlt; Hb0_QT~  
  BOOL m_bShift; aNP\Q23D  
  CString m_Path; d|>/eb.R  
  CString m_Number; `R!Q(rePx  
  //}}AFX_DATA X0]{8v%  
  // ClassWizard generated virtual function overrides ~ +h4i'  
  //{{AFX_VIRTUAL(CCaptureDlg) G|u)eW  
 public: wsB  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .q1y)l-^Z  
 protected: Q" r y@ (I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wHh6y?g\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); n'[>h0  
  //}}AFX_VIRTUAL 6sG5 n7E-A  
  // Implementation &hih p"  
 protected: m|3 Q'  
  HICON m_hIcon; }42Hhu7j  
  // Generated message map functions E;wT4 T=  
  //{{AFX_MSG(CCaptureDlg) ZsSW{ffZ77  
  virtual BOOL OnInitDialog(); FmSE ]et  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _qk yU)z  
  afx_msg void OnPaint(); ld3H"p rR  
  afx_msg HCURSOR OnQueryDragIcon(); EvH/d4V;  
  virtual void OnCancel(); Vh>|F}%E  
  afx_msg void OnAbout(); vo(:g6$  
  afx_msg void OnBrowse(); *HB 32 =qD  
  afx_msg void OnChange(); gegM&Xo  
 //}}AFX_MSG H4W!Md  
 DECLARE_MESSAGE_MAP() '2 Y8  
}; 7M8cF>o  
#endif NY|hE@{2.  
>~_z#2PA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `@ny!S|1/  
#include "stdafx.h" 6\k~q.U@XI  
#include "Capture.h" &hrMpD6z6i  
#include "CaptureDlg.h" +\$c_9|C+  
#include <windowsx.h> X *EseC  
#pragma comment(lib,"hook.lib") *,t/IA|  
#ifdef _DEBUG AN3oh1xe:  
#define new DEBUG_NEW z?pi /`y8>  
#undef THIS_FILE 8 Vf #t!t  
static char THIS_FILE[] = __FILE__; i[I&m]N  
#endif Ve${g`7&  
#define IDM_SHELL WM_USER+1 Y>at J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <@[;IX`YN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (V1;`sI8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; w 62m}5eA  
class CAboutDlg : public CDialog [XttT  
{ (H"{r  
 public:  q*94vo-  
  CAboutDlg(); $41<ldJ  
  // Dialog Data hQ(^;QcSu  
  //{{AFX_DATA(CAboutDlg) l(Dr@LB~  
  enum { IDD = IDD_ABOUTBOX }; Xu E' %;:  
  //}}AFX_DATA !&:Cp_  
  // ClassWizard generated virtual function overrides  ? 8/r=  
  //{{AFX_VIRTUAL(CAboutDlg) zliMG=6  
 protected: )Ly ~\*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u80C>sQ  
  //}}AFX_VIRTUAL &*Xrh7K2e  
  // Implementation w]nt_xj  
 protected: #%F-Xsk  
  //{{AFX_MSG(CAboutDlg) dm]g:KWg  
  //}}AFX_MSG pL!,1D!  
  DECLARE_MESSAGE_MAP() 7r^Cs#b+I  
}; (>E/C^Tc%  
#d*0 )w  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) RyU8{-q  
{ 5*+DN U@  
 //{{AFX_DATA_INIT(CAboutDlg) 'J3yJ{  
 //}}AFX_DATA_INIT !Z |_3  
} 4_ypFuS^  
[V qiF~o,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -#mN/  
{ \4^zY'  
 CDialog::DoDataExchange(pDX); b8Z_o N5!  
 //{{AFX_DATA_MAP(CAboutDlg) S(nQ?;9,  
 //}}AFX_DATA_MAP 63J3NwFt  
} >F:1a\c  
.c&&@>m@.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V8nQ/9R;  
 //{{AFX_MSG_MAP(CAboutDlg) tQRbNY#}Z  
 // No message handlers GyMN;|  
 //}}AFX_MSG_MAP /W`CqJk-*.  
END_MESSAGE_MAP() _KKux3a  
F(zCvT   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ju3@F8AI  
: CDialog(CCaptureDlg::IDD, pParent) :*BN>*1^\r  
{ :3XvHL0rx  
 //{{AFX_DATA_INIT(CCaptureDlg) _'1 7C /  
  m_bControl = FALSE; lZ)6d-vK  
  m_bAlt = FALSE; xf/K+  
  m_bShift = FALSE; . AOc$Nt  
  m_Path = _T("c:\\"); mtkZF{3Jx  
  m_Number = _T("0 picture captured."); M$Ui=GGq  
  nCount=0; #d3_7rI0V  
  bRegistered=FALSE; V=p"1!(  
  bTray=FALSE; -s!J3DB  
 //}}AFX_DATA_INIT D\+x/r?-I  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4H;7GNu  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); GD)paTwO<  
} ,YjjL  
(gPB@hAv  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) B~k{f}  
{ '3U,UD5EG  
 CDialog::DoDataExchange(pDX); Y:\]d1C  
 //{{AFX_DATA_MAP(CCaptureDlg) O`1!&XT{x  
  DDX_Control(pDX, IDC_KEY, m_Key); y9]7LETv\M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {D^ )% {  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ULu@"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k{lo'  
  DDX_Text(pDX, IDC_PATH, m_Path); w'A*EWO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); V6](_w!  
 //}}AFX_DATA_MAP :RukW.MR  
} $xdo=4;|  
pfIK9>i  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xzOvc<u  
//{{AFX_MSG_MAP(CCaptureDlg) A'7Y{oPHX  
 ON_WM_SYSCOMMAND() $H.U ~  
 ON_WM_PAINT() WRkuPj2  
 ON_WM_QUERYDRAGICON() \p( 0H6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) BeQ'\#q,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ix,b-C~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) N0}[&rE 8  
//}}AFX_MSG_MAP ;<[!;8  
END_MESSAGE_MAP() /DH`7E  
OmZZTeGg1s  
BOOL CCaptureDlg::OnInitDialog() iG"v  
{ <dE~z]P  
 CDialog::OnInitDialog(); 2]Cn<zJ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); T+~&jC:{  
 ASSERT(IDM_ABOUTBOX < 0xF000); H1%o)'Kut4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l{.PyU5)  
 if (pSysMenu != NULL) *0@Z+'M?  
 { PPrvVGP   
  CString strAboutMenu; ewN|">WXQ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3I)oqS@q'  
  if (!strAboutMenu.IsEmpty()) E&z^E2  
  { Iurz?dt4w  
   pSysMenu->AppendMenu(MF_SEPARATOR); BR?DW~7J j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v(JjvN21  
  } *y|w9 r p  
 } c)N_"#&  
 SetIcon(m_hIcon, TRUE); // Set big icon U?|A3;,xh  
 SetIcon(m_hIcon, FALSE); // Set small icon !BrZTo  
 m_Key.SetCurSel(0); 9}2/ko  
 RegisterHotkey(); 3AR'Zvn  
 CMenu* pMenu=GetSystemMenu(FALSE); g#l!b%$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 35AH|U7b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tC$+;_=+F  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j|o/>^ 'e  
 return TRUE; // return TRUE unless you set the focus to a control ? eI)m  
} n} !')r  
/Us+>vg!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dc~vQDNw[X  
{ K%BFR,)g  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^/Yk*Ny  
 { :N^B54o%6  
  CAboutDlg dlgAbout; -{JReplc  
  dlgAbout.DoModal(); K iXD1Zpz  
 } s nxwe  
 else v,N!cp1  
 { Q2]7|C  
  CDialog::OnSysCommand(nID, lParam); "30=!k  
 } [:e>FXV  
} y6sY?uu  
w^HI lA  
void CCaptureDlg::OnPaint() bOrE86v:  
{ yGWl8\,j0  
 if (IsIconic()) s5{H15  
 { JUDZ_cGr  
  CPaintDC dc(this); // device context for painting j!Ys/ D  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); SI%J+Y7  
  // Center icon in client rectangle SJj_e-  
  int cxIcon = GetSystemMetrics(SM_CXICON); .3Smqwm=Y  
  int cyIcon = GetSystemMetrics(SM_CYICON); Vu~fF@ |  
  CRect rect; C'l\4ij)7  
  GetClientRect(&rect); 2fc+PE  
  int x = (rect.Width() - cxIcon + 1) / 2; n]5Pfg|a  
  int y = (rect.Height() - cyIcon + 1) / 2; 0{o 8-#  
  // Draw the icon ;YQ6X>  
  dc.DrawIcon(x, y, m_hIcon); !f/^1k}SR  
 } >tL" 8@z9  
 else X,o ]tgg=  
 { d3T7$'l$  
  CDialog::OnPaint(); o!y<:CGL  
 } AlrUfSBB  
} WRAv>s9  
<>-gQ9  
HCURSOR CCaptureDlg::OnQueryDragIcon() M_75bU  
{ .g}Y! l  
 return (HCURSOR) m_hIcon; kIt1kw  
} 6~s{HI!  
c(?OE' "Z  
void CCaptureDlg::OnCancel() MfLus40;n  
{ ^( C,LVP<  
 if(bTray) EOqV5$+  
  DeleteIcon(); c[OQo~m$  
  CDialog::OnCancel(); M5`m5qc3  
} hdM?Uoo(4a  
*x 2u  
void CCaptureDlg::OnAbout() 3+U2oI:I  
{ }gX4dv B  
 CAboutDlg dlg; 5/m*Lc+r  
 dlg.DoModal(); I] m&h!  
} |?' gT" #  
vl%Pg !l  
void CCaptureDlg::OnBrowse() 7#*O|t/'  
{ Dn~t_n  
 CString str; &|zV Wl  
 BROWSEINFO bi; 5KYR"-jY  
 char name[MAX_PATH]; u<j.XPK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }zeKf/?'  
 bi.hwndOwner=GetSafeHwnd(); f'S0 "  
 bi.pszDisplayName=name; #]}G{ P  
 bi.lpszTitle="Select folder"; X)9|ZF2`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; o+<hI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4=* ml}RP  
 if(idl==NULL) :NH '>'  
  return; ^'sOWIzeiY  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &j{I G`Trl  
 str.ReleaseBuffer(); F20%r 0  
 m_Path=str; 1&kf2\S  
 if(str.GetAt(str.GetLength()-1)!='\\') )=,;-&AR  
  m_Path+="\\"; 6X VJ/qZ  
 UpdateData(FALSE); \nVoBW(  
} 1b!5h  
i2Gh!5]f  
void CCaptureDlg::SaveBmp() H{d/%}7[v  
{ U.W Mu%  
 CDC dc; <lSo7NkR  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); DB] ]6  
 CBitmap bm; d k|X&)xTJ  
 int Width=GetSystemMetrics(SM_CXSCREEN); [vCZD8"Y8  
 int Height=GetSystemMetrics(SM_CYSCREEN); U:IeMf-;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :Sk<0VVd7  
 CDC tdc; 3_ =:^Z  
 tdc.CreateCompatibleDC(&dc); +n8,=}  
 CBitmap*pOld=tdc.SelectObject(&bm); O}Do4>02  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KR4RIJZ_t  
 tdc.SelectObject(pOld); @|~D?&<\  
 BITMAP btm; E|B1h!!\c  
 bm.GetBitmap(&btm); 'BEM:1)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; UFa00t^5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); !P_'n  
 BITMAPINFOHEADER bih; <{1 3Nd'o  
 bih.biBitCount=btm.bmBitsPixel; n] n3/wpO  
 bih.biClrImportant=0; Yg`z4 U'6~  
 bih.biClrUsed=0; iJu$&u  
 bih.biCompression=0; C1~Ro9si  
 bih.biHeight=btm.bmHeight; ,rQPs  
 bih.biPlanes=1; MWc{7,  
 bih.biSize=sizeof(BITMAPINFOHEADER); _~ 7cn  
 bih.biSizeImage=size; =j1Q5@vS  
 bih.biWidth=btm.bmWidth; ;\+A6(GX{  
 bih.biXPelsPerMeter=0; 0`e- ;  
 bih.biYPelsPerMeter=0; +)d7SWO6]!  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :w c.V  
 static int filecount=0; Tq >?.bq9  
 CString name; W3i X;-Z  
 name.Format("pict%04d.bmp",filecount++); :cTwp K  
 name=m_Path+name; Dr"F5Wbg  
 BITMAPFILEHEADER bfh; gB#$"mq,  
 bfh.bfReserved1=bfh.bfReserved2=0; y `w5u.'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); TqMy">>  
 bfh.bfSize=54+size; 4dvuw{NZ  
 bfh.bfOffBits=54; D#&N?< }  
 CFile bf; gLv";"4S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .J|" bs9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^`!EpO>k9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); iW <B1'dp  
  bf.WriteHuge(lpData,size); YPav5<{a  
  bf.Close(); P}Ule|&LK  
  nCount++; 5 %aT  
 } R:DW>LB  
 GlobalFreePtr(lpData); j6)@kW9x  
 if(nCount==1) V0 OT_F  
  m_Number.Format("%d picture captured.",nCount); ='r4z z  
 else utwqP~  
  m_Number.Format("%d pictures captured.",nCount); 9Fxz9_ i  
  UpdateData(FALSE); Rs%6O|u7  
} Wj. _{  
~x}=lKN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T\Q)"GB  
{ 8/E?3a_g-  
 if(pMsg -> message == WM_KEYDOWN) Fop "m/  
 { E%+1^ L  
  if(pMsg -> wParam == VK_ESCAPE) l4Y}<j\;  
   return TRUE; =zW.~(c{  
  if(pMsg -> wParam == VK_RETURN) PfVjfrI[  
   return TRUE; )Ikx0vDFQ  
 } ^?tF'l`  
 return CDialog::PreTranslateMessage(pMsg); >U$,/_uMNW  
} [&FWR  
M0%):P?x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "%Eyb\V!  
{ /ZKO\q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~A=Z/46*Z  
  SaveBmp(); 8>K2[cPD  
  return FALSE; f8 M=P.jz  
} l*yJU3PW  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s?*MZC  
 CMenu pop; A5gdZZ'x  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); C"ZCX6p+$  
 CMenu*pMenu=pop.GetSubMenu(0); } Pc6_#  
 pMenu->SetDefaultItem(ID_EXITICON); &wZ:$lK#o  
 CPoint pt; p,9eZUGy  
 GetCursorPos(&pt); fXYg %  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <%Re!y@OL  
 if(id==ID_EXITICON) TNV#   
  DeleteIcon(); aOj5b>>  
 else if(id==ID_EXIT) X"{s"Mc0G  
  OnCancel(); U(=cGA.$  
 return FALSE; scUWI"  
} =lG5Kc{B  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2FS,B\d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;wz YZ5=Di  
 AddIcon(); CxtH?9# |  
 return res; A{hWFSv  
} > c7fg^@  
Piz/vH6M}  
void CCaptureDlg::AddIcon() d+fi g{<b  
{ 2,<!l(X  
 NOTIFYICONDATA data; =GjxqIv  
 data.cbSize=sizeof(NOTIFYICONDATA); ( UV8M\  
 CString tip; s?5(E}  
 tip.LoadString(IDS_ICONTIP); Tl Z|E '_C  
 data.hIcon=GetIcon(0); \^3\_T&6  
 data.hWnd=GetSafeHwnd(); #f@sq5pTO  
 strcpy(data.szTip,tip); z>hG'  
 data.uCallbackMessage=IDM_SHELL; ?ei7jM",  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; QSy=JC9  
 data.uID=98; cQUmcK/,  
 Shell_NotifyIcon(NIM_ADD,&data); O.*,e  
 ShowWindow(SW_HIDE); 8<6;X7<-  
 bTray=TRUE; */RtN`dh  
} |k> _ jO  
!T|X/B R  
void CCaptureDlg::DeleteIcon() (a1s~  
{ Z %MP:@z  
 NOTIFYICONDATA data; y)!K@  
 data.cbSize=sizeof(NOTIFYICONDATA); -q\1Tlc]3  
 data.hWnd=GetSafeHwnd(); BaTE59W  
 data.uID=98; NQ%lwE~  
 Shell_NotifyIcon(NIM_DELETE,&data); qMz0R\4  
 ShowWindow(SW_SHOW); Wel-a< e  
 SetForegroundWindow(); @QMMtfeLj  
 ShowWindow(SW_SHOWNORMAL); H5=-b@(  
 bTray=FALSE; q=E<y  
} jO$3>q  
Xi1/wbC  
void CCaptureDlg::OnChange() Pd\S{ Y~wk  
{ F\&R nDJ  
 RegisterHotkey(); [*#ms=Zdc  
} fXBA P10#  
z}N=Oe  
BOOL CCaptureDlg::RegisterHotkey() _y),C   
{  #IyxH$  
 UpdateData(); K9gfS V>]  
 UCHAR mask=0; 4RNB\D  
 UCHAR key=0; Hc4]2pf  
 if(m_bControl) HkEfBQmh  
  mask|=4; Qg9 N?e{z  
 if(m_bAlt) }0|,*BkI m  
  mask|=2; KyNv)=x4c  
 if(m_bShift) o|AV2FM)  
  mask|=1; b4s.`%U  
  key=Key_Table[m_Key.GetCurSel()]; Z@ * ^4Ve  
 if(bRegistered){ $v+Q~\'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); N'!a{rF  
  bRegistered=FALSE; `(EY/EsY  
 } =\?KC)F*e  
 cMask=mask; BD9W-mF  
 cKey=key; ,)nO   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); PygaW&9Z|d  
 return bRegistered; Lu6!W  
} WeE>4>^  
,Rk;*MEMJ  
  四、小结 ">lu8F  
;2-,Xzz8  
  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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