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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: QFnuu-82"  
  x}2nn)fdZ  
  一、实现方法 I[E 6N2  
b`e_}^,c  
  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: Ug*B[q/  
Jxl'!8t  
#pragma data_seg("shareddata") WsbVO|C  
HHOOK hHook =NULL; //钩子句柄 jr6 0;oK+  
UINT nHookCount =0; //挂接的程序数目 ]t<=a6 <P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &A s>Y,y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 EC,,l'%a|/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v7(7WfqP  
static int KeyCount =0; ;Tbo \Wp9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Zv yZ5UA  
#pragma data_seg() B~:yM1f@u4  
3nA^s"#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。 #ed|0  
sm18u-  
  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: jwwRejNV  
C).\ J !  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @Z/jaAjUC  
cKey,UCHAR cMask) F w{:shC  
{ J@>|`9T9$  
 BOOL bAdded=FALSE; YI0l&'7  
 for(int index=0;index<MAX_KEY;index++){ ,X/j6\VBO  
  if(hCallWnd[index]==0){ :}_hz )  
   hCallWnd[index]=hWnd; 7c_2.T@4  
   HotKey[index]=cKey; ~2* LWH*@  
   HotKeyMask[index]=cMask; o?ug`m"  
   bAdded=TRUE; 2>jk@~Z1:u  
   KeyCount++; +xuv+mo  
   break; X&[Zk5DU*  
  } KaEaJ  
 } 23CvfP  
 return bAdded; !W XV1S  
} ,OlS>>,  
//删除热键 |2'WSAWG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .7.1JT#@A7  
{ J>R $K  
 BOOL bRemoved=FALSE; SB%D%Zx6'%  
 for(int index=0;index<MAX_KEY;index++){ POk5+^  
  if(hCallWnd[index]==hWnd){ =.s0"[%   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nHRsr x  
    hCallWnd[index]=NULL; cPcH 8Vd  
    HotKey[index]=0; i>S@C@~  
    HotKeyMask[index]=0; *Y8 5ev q  
    bRemoved=TRUE; 09 McUR@  
    KeyCount--; Ep-bx&w+  
    break; &Sb)a  
   } bR3Crz(9G  
  } i).Vu}W#S  
 } x((u  
 return bRemoved; #;99vwc  
} gy?uk~p  
F7' MoH  
{zZ)JWM<w  
  DLL中的钩子函数如下: = V')}f~C  
'-myOM7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y;Nq(  
{ HB#!Dv&'  
 BOOL bProcessed=FALSE; e <+)IW:  
 if(HC_ACTION==nCode) S\ak(<X  
 { tRPIvq/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 sm"Rp~[i  
   switch(wParam) G#Bm">+  
   {  :Y Ls]JI<  
    case VK_MENU: , $!F,c  
     MaskBits&=~ALTBIT; M2V`|19Q  
     break; <f (z\pi1  
    case VK_CONTROL: 2aTq?ZR|8A  
     MaskBits&=~CTRLBIT; NEIF1( :  
     break; @=G [mc\  
    case VK_SHIFT: }\m.~$|[  
     MaskBits&=~SHIFTBIT; Qu#[PDhb  
     break; WS6Qp`c )e  
    default: //judge the key and send message PkFG0  
     break; H3!9H  
   } K 91O$'J  
   for(int index=0;index<MAX_KEY;index++){ w nBvJb]4l  
    if(hCallWnd[index]==NULL) #[i3cn  
     continue; nKd'5f1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -5v{p  
    { @u$NB3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R{[v#sF >#  
     bProcessed=TRUE; pj7a l;  
    } +PBl3  
   } p+ReQ.5|  
  } S*n5d>;  
  else if((lParam&0xc000ffff)==1){ //有键按下 5(2 C  
   switch(wParam) p%iZ6H>G  
   { tVf):}<h  
    case VK_MENU: Vk`Uz1*  
     MaskBits|=ALTBIT; Z;NaIJiL-  
     break; Eve,*ATI  
    case VK_CONTROL: ,2U  
     MaskBits|=CTRLBIT; W)Mz1v #s  
     break; =,6X_m  
    case VK_SHIFT: EPwU{*F  
     MaskBits|=SHIFTBIT; VI|2vV6?  
     break; Mq\?J{E  
    default: //judge the key and send message z(,j)".  
     break; +P+h$gQ  
   } Lo}T%0"G  
   for(int index=0;index<MAX_KEY;index++){ rR ^o  
    if(hCallWnd[index]==NULL) R'1j  
     continue; 4h?@D_{k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CXGMc)#>f  
    { A|PZ<WAY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %qqCpg4  
     bProcessed=TRUE; 6J- /%  
    } KXz7l\1Gb  
   } mYfHBW:  
  } OW6dK #CFt  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \d.\M  
   for(int index=0;index<MAX_KEY;index++){ %jx<<hW  
    if(hCallWnd[index]==NULL) vz3olHX  
     continue; jZ"j_ =o@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?ecR9X k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~("bpS#ZgD  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 b%x=7SMXO  
   } XL44pE m  
  } 2zbn8tO  
 } ./zzuKO8XK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L)<~0GcP  
} *6][[)(  
*T}c{/  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 6)ysiAH?  
w87$p821  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H}&JrT95  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "Q\b6 7Ch  
7wY0JS$fz  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: rmC7!^/  
Rxr?T-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eu]qgtg~U  
{ 4Wvefq"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *>:<  
 { yK"HHdYTV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 JbitRV@a  
  SaveBmp(); xFIzq  
  return FALSE; 'ahZ*@kr  
 } mBB"e"o  
 …… //其它处理及默认处理 ;*+H&  
} t+pA9^$[ `  
<Mj{pN3  
NU'2QSU8  
  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。 aMT=pGU  
#}Xsi&:XU  
  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。 Y~*aA&D  
*2.h*y'u  
  二、编程步骤 ]R!YRu  
u] G  
  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"; e\-,e+  
lqO>Q1_{K  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A@Zqh<,Ud  
<Voct  
  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; WuI$   
A5\ Hq  
  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; xh#pw2v7V  
p/l">d]+  
  5、 添加代码,编译运行程序。 p)z#%BY56  
oLq N  
三、程序代码 '6g-]rE[  
M$!-B,1BX  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {KK/mAp{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {: \LFB_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ rf`xY4I\  
#if _MSC_VER > 1000 RFSwX*!  
#pragma once OwNo$b]h`  
#endif // _MSC_VER > 1000 @.)[U:N  
#ifndef __AFXWIN_H__ xzFQ)t&  
#error include 'stdafx.h' before including this file for PCH Vo.~1^  
#endif fo~*Bp()-E  
#include "resource.h" // main symbols WCk. K  
class CHookApp : public CWinApp +!:=Mm  
{ ^qVBgBPb  
 public: /C <p^#g9.  
  CHookApp(); .kkhW8:  
  // Overrides 6]?W&r|0I  
  // ClassWizard generated virtual function overrides KW ZEi?  
  //{{AFX_VIRTUAL(CHookApp) jS8B:>  
 public: mQSn*;9\T3  
  virtual BOOL InitInstance(); )%kiM<})  
  virtual int ExitInstance(); $Xu/P5  
  //}}AFX_VIRTUAL `PI*\t0  
  //{{AFX_MSG(CHookApp) O'@[ f{  
  // NOTE - the ClassWizard will add and remove member functions here. eJ ^I+?h  
  // DO NOT EDIT what you see in these blocks of generated code ! Ejf5M\o  
  //}}AFX_MSG LylCr{s7  
  DECLARE_MESSAGE_MAP() `|v/qk7 ^?  
}; z;/8R7L&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); D6fd(=t1Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'qG-)2 t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /?b{*<TK  
BOOL InitHotkey(); o=Mm=;H  
BOOL UnInit(); \P"Ol\@  
#endif qUn+1.[%  
.LnknjC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z.x]6  
#include "stdafx.h" 3zc;_U2  
#include "hook.h" Jt<J#M<}7  
#include <windowsx.h> \~Ml<3Zd:  
#ifdef _DEBUG ]n"U])pJd  
#define new DEBUG_NEW ( *K)D$y  
#undef THIS_FILE Nz*,m'-1e  
static char THIS_FILE[] = __FILE__; rQ2TPX<?a  
#endif !mB `FC  
#define MAX_KEY 100 >#gDk K  
#define CTRLBIT 0x04 .N# KW  
#define ALTBIT 0x02 zuFPG{^\#  
#define SHIFTBIT 0x01 qzO5p=}  
#pragma data_seg("shareddata") ^j10 f$B  
HHOOK hHook =NULL; >pJ#b=  
UINT nHookCount =0; ;kR=vv  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~v:IgS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ufw[Ei$I:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -okq= 9  
static int KeyCount =0; *DZ7,$LQ~D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \}Iq-Je   
#pragma data_seg() D,lY_6=  
HINSTANCE hins; &h!O<'*2  
void VerifyWindow(); %q9"2] cR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T2tvU*[=  
//{{AFX_MSG_MAP(CHookApp) h^1 !8oOYD  
// NOTE - the ClassWizard will add and remove mapping macros here. \I<R.4 9oW  
// DO NOT EDIT what you see in these blocks of generated code! SkCux  
//}}AFX_MSG_MAP pp7 $Q>6  
END_MESSAGE_MAP() =w"Kkj>%oh  
=*zde0T?l  
CHookApp::CHookApp() Q7d@+C  
{ y7rT[f/J  
 // TODO: add construction code here, wf\7sz  
 // Place all significant initialization in InitInstance p&)d]oV>  
} ;mGPX~38  
cq3Z}Cp  
CHookApp theApp; 1,]FLsuy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W!Hn`T   
{ bGy|T*@  
 BOOL bProcessed=FALSE; @de0)AJG6  
 if(HC_ACTION==nCode) L 8;H_:~_'  
 { 5~im.XfiVx  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0 VG;z#{J  
   switch(wParam) f5{|_]q]  
   { J~oxqw}  
    case VK_MENU: 2dHsM'ze  
     MaskBits&=~ALTBIT; o1*P|.`  
     break; 3p?nQ O)L  
    case VK_CONTROL: C+%eT&OO  
     MaskBits&=~CTRLBIT; [?qzMFb  
     break; }QQ 7jE  
    case VK_SHIFT: `R7dn/  
     MaskBits&=~SHIFTBIT; X?&{< vz  
     break; _6`GHx   
    default: //judge the key and send message 'iOa j0f  
     break; v"mZy,u  
   } s16, *;Z  
   for(int index=0;index<MAX_KEY;index++){ H8HVmfM  
    if(hCallWnd[index]==NULL) #Q-#7|0&  
     continue; /`nkz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]s E)-8  
    { piuM#+Y\'S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H!OX1F  
     bProcessed=TRUE; Iu5 9W >  
    } 8t) g fSG  
   } "9"  
  } %B1)mA;  
  else if((lParam&0xc000ffff)==1){ //Key down "M\rO!f:  
   switch(wParam) _O11SiP]  
   { d<HO~+9  
    case VK_MENU: '|) ,?  
     MaskBits|=ALTBIT; u?g&(h  
     break; .n4{xQo,EJ  
    case VK_CONTROL: R?/xH=u>  
     MaskBits|=CTRLBIT; ?~.:C'  
     break; cR,'aX  
    case VK_SHIFT:  2+S+Y%~  
     MaskBits|=SHIFTBIT; v,z~#$T&  
     break; B4*y-Q.*  
    default: //judge the key and send message bAN>\zG+  
     break; AkdO:hVtG  
   } C+jXH)|iq  
   for(int index=0;index<MAX_KEY;index++) 6K<o0=,jm2  
   { j72mm!  
    if(hCallWnd[index]==NULL) VlSM/y5  
     continue; jvD_{r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7 b(  
    { YjJ^SU`*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Q-#<{' (  
     bProcessed=TRUE; V[]Pya|s+  
    } 8O60pB;4  
   } E?bv<L,"  
  } oSf`F1;)HQ  
  if(!bProcessed){ *PB/I4>{  
   for(int index=0;index<MAX_KEY;index++){ BS,EW  
    if(hCallWnd[index]==NULL) &5bIM>)v  
     continue; [wiB1{/Ls.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *//z$la  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `kv7Rr}Q  
   } SDNRcSbOD6  
  } XP:fL NpQ  
 } _*8 6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C!9mygI  
} #w\x-i|  
>9i>A:  
BOOL InitHotkey() 7ncR2-{g  
{ pR=R{=}wV  
 if(hHook!=NULL){ A{k1MA<F6  
  nHookCount++; < 3*q) VT  
  return TRUE; S')DAx  
 } hA1B C3  
 else 6#K.n&=*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {<gX~./]c  
  if(hHook!=NULL) e{Vn{.i,5  
   nHookCount++; ,F` 1VpTd8  
  return (hHook!=NULL); So e2Gq  
} f7!48,(fB  
BOOL UnInit() % WXl*  
{ S1@r.z2L  
 if(nHookCount>1){ ,aBy1K  
  nHookCount--; {hN<Ot  
  return TRUE; !7Qj8YmS  
 } I|K!hQ"m  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :oC;.u<*8  
 if(unhooked==TRUE){ *8;<w~  
  nHookCount=0; ' S,g3  
  hHook=NULL; gzH;`,  
 } * a1q M?  
 return unhooked; `k8jFB C  
} BD}%RTeWKq  
NV?XZ[<*<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -)Vy)hD,  
{ ZqpK}I  
 BOOL bAdded=FALSE; w`+-xT%  
 for(int index=0;index<MAX_KEY;index++){ v*.iNA;&i  
  if(hCallWnd[index]==0){ <RbfW'<G  
   hCallWnd[index]=hWnd; z7L+wNYwg  
   HotKey[index]=cKey; !wfUD2 K1  
   HotKeyMask[index]=cMask; .f;@O qU  
   bAdded=TRUE; ePIN<F;I  
   KeyCount++; ydY 7 :D  
   break; $UK m[:7  
  } ?$tD  
 } L]"$d F  
 return bAdded; b\o>4T  
} _h,_HW)G  
3fXrwmBT8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) c+T`X?.j  
{ NG:4Q.G1g  
 BOOL bRemoved=FALSE; @OUBo;/  
 for(int index=0;index<MAX_KEY;index++){ JdUdl_D z  
  if(hCallWnd[index]==hWnd){ TgDT  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?MmQ'1N  
    hCallWnd[index]=NULL; )p>p3b g  
    HotKey[index]=0; u>agVB4\F  
    HotKeyMask[index]=0; 8\:>;XG6f  
    bRemoved=TRUE; 7t}s5}Z 4  
    KeyCount--; -'d`(G"  
    break; 4 x4[  
   } h)j#?\KYm9  
  } f?eq-/UR  
 } w2/3[VZ}l  
 return bRemoved; )K$xu(/K  
} O7LJ-M  
-b8SaLak  
void VerifyWindow() VYh/ URU>  
{ $3&XM  
 for(int i=0;i<MAX_KEY;i++){ XkoPN]0n  
  if(hCallWnd!=NULL){ +t&)Z  
   if(!IsWindow(hCallWnd)){ ;V?(j 3b[  
    hCallWnd=NULL; 0.nkh6 ?  
    HotKey=0; !Y7$cU &  
    HotKeyMask=0; y!R9)=/M  
    KeyCount--; qxHn+O!h  
   } \+Y=}P>  
  } )^4Ljb1  
 } Bj><0 cNF  
} 0raFb,6l  
BI*0JKQu  
BOOL CHookApp::InitInstance() T \- x3i  
{ &0|Z FXPd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1uG)U)y/Q  
 hins=AfxGetInstanceHandle(); #r?[@aJ  
 InitHotkey(); P ecZuv  
 return CWinApp::InitInstance(); UGgo;e  
} KC2Z@  
8'TIDu  
int CHookApp::ExitInstance() 7P*\|Sxk%  
{ t98S[Z(-%+  
 VerifyWindow(); +_S0  
 UnInit(); c~OPH 0,  
 return CWinApp::ExitInstance(); /kRCCs8t}  
} 52Dgul  
5A|d hw   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #Hu# #x|  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0YfmAF$/B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kX}sDvP3  
#if _MSC_VER > 1000 *mWl=J;u  
#pragma once iCh 8e>+  
#endif // _MSC_VER > 1000 =-GxJ PL  
~Jsu"kr  
class CCaptureDlg : public CDialog 88[u^aC  
{ Q!=`|X|:  
 // Construction EK0~ 3HSZ  
 public: V\r{6-%XiW  
  BOOL bTray; _:5t~29  
  BOOL bRegistered; 8)pL0bg  
  BOOL RegisterHotkey(); W7_m,{q  
  UCHAR cKey; VnB HQ.C  
  UCHAR cMask; ;XjXv'  
  void DeleteIcon(); B^GMncZO  
  void AddIcon(); ~Jw84U{$  
  UINT nCount; 3K/ tB1  
  void SaveBmp(); |F<iu2\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor mSZg;7DE3*  
  // Dialog Data <u0}&/  
  //{{AFX_DATA(CCaptureDlg) ?vI2mr a+  
  enum { IDD = IDD_CAPTURE_DIALOG }; di9OQ*6a7  
  CComboBox m_Key; ^u"WWLZ  
  BOOL m_bControl; 0nB[Udk?  
  BOOL m_bAlt; FyPG5-  
  BOOL m_bShift; qIQ 61><  
  CString m_Path; VQG$$McJ  
  CString m_Number; @H+L1H%9n  
  //}}AFX_DATA 9(z) ^ G  
  // ClassWizard generated virtual function overrides 7j&EQm5\9  
  //{{AFX_VIRTUAL(CCaptureDlg) Yjd/  
 public: _G.!^+)kEm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ef ?|0Gm  
 protected: N1.1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lz-|M?(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !hS)W7!ik  
  //}}AFX_VIRTUAL OU#p^ 5K  
  // Implementation 94t`&jZ&|u  
 protected: 6d/v%-3  
  HICON m_hIcon; +s;Vfc$b]H  
  // Generated message map functions hmG8 {h/  
  //{{AFX_MSG(CCaptureDlg) ~ QohP`_  
  virtual BOOL OnInitDialog(); g&EK^q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |4 2;171  
  afx_msg void OnPaint(); _29wQn@]  
  afx_msg HCURSOR OnQueryDragIcon(); "XLtrAu{  
  virtual void OnCancel(); Yl"CIgt  
  afx_msg void OnAbout(); shy[>\w  
  afx_msg void OnBrowse(); U@n5:d=  
  afx_msg void OnChange(); z\8s |!  
 //}}AFX_MSG o:3(J}  
 DECLARE_MESSAGE_MAP() vx ' ];  
}; P6ktA-Hv>  
#endif LayK&RwL  
4(oU88 z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;~d$O M  
#include "stdafx.h" :& :P4Y1 E  
#include "Capture.h" -%%Xx5D  
#include "CaptureDlg.h" Sj|tR[SAoD  
#include <windowsx.h> EEK!'[<,sE  
#pragma comment(lib,"hook.lib") pYr+n9)^  
#ifdef _DEBUG .oTS7rYw  
#define new DEBUG_NEW t)?K@{ 9  
#undef THIS_FILE Y`4 LMK[]  
static char THIS_FILE[] = __FILE__; J=: \b  
#endif Q^3{L\6_  
#define IDM_SHELL WM_USER+1 -vY5h%7kf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =&9c5"V&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BOcD?rrZ0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -KfK~P3PF  
class CAboutDlg : public CDialog 4e AMb  
{ >b=."i  
 public: ONDO xXs  
  CAboutDlg(); G%>[7]H  
  // Dialog Data >G%oWRk  
  //{{AFX_DATA(CAboutDlg) oJ3(7Sz  
  enum { IDD = IDD_ABOUTBOX }; +r;t]  
  //}}AFX_DATA tCGx]\  
  // ClassWizard generated virtual function overrides &k)v/  
  //{{AFX_VIRTUAL(CAboutDlg) 5$Kj#9g-#  
 protected: M<NY`7$^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6<QC|>p  
  //}}AFX_VIRTUAL t6mv  
  // Implementation pnz:<V"Y(  
 protected: :FH&#Eq~4  
  //{{AFX_MSG(CAboutDlg) &IzNoB  
  //}}AFX_MSG w3sU&  |N  
  DECLARE_MESSAGE_MAP() aBG^Xhx  
}; *x]*%  
~x<?Pj  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \)o.Y zAo@  
{ X/vyb^:U  
 //{{AFX_DATA_INIT(CAboutDlg) $\/^O94-l  
 //}}AFX_DATA_INIT JN`$Fq+  
} HQ7g0:-^a>  
|mHf 7gCX  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l:JVt`A4?  
{ ;fW~Gb?"  
 CDialog::DoDataExchange(pDX); yTK3eK  
 //{{AFX_DATA_MAP(CAboutDlg) cqJXZ.X C  
 //}}AFX_DATA_MAP /J/V1dC}]D  
} |W=-/~X  
-vT{D$&1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \-[bU6\A\  
 //{{AFX_MSG_MAP(CAboutDlg) }79jyS-e  
 // No message handlers iDl#foXa`  
 //}}AFX_MSG_MAP oPni4^g i  
END_MESSAGE_MAP() zaLPPm&f  
}+pwSjsno  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D& o\q68W  
: CDialog(CCaptureDlg::IDD, pParent) x0ipk}  
{ ~TS!5Wiv  
 //{{AFX_DATA_INIT(CCaptureDlg) 8]b;l; W5  
  m_bControl = FALSE; \9` ~9#P  
  m_bAlt = FALSE; ?a% F3B  
  m_bShift = FALSE; cHT\sJo`l  
  m_Path = _T("c:\\"); y {Bajil  
  m_Number = _T("0 picture captured."); 6jgP/~hP>N  
  nCount=0; "9QZX[J|*  
  bRegistered=FALSE; \~+b&  
  bTray=FALSE; 8OV =;aM?{  
 //}}AFX_DATA_INIT G6W|l2P!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 PLz+%L;{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'Q :%s  
} uYg Q?*Z  
4 ?PB Fbd  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Kb{&a  
{ U5~aG!E  
 CDialog::DoDataExchange(pDX); 0#8, (6  
 //{{AFX_DATA_MAP(CCaptureDlg) ;]m;p,$  
  DDX_Control(pDX, IDC_KEY, m_Key); 32SkxcfrCK  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )AR- b8..o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :A @f[Y'9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )[ZXPD  
  DDX_Text(pDX, IDC_PATH, m_Path); T$R#d&t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); V V}"zc^  
 //}}AFX_DATA_MAP #V]8FW  
} 9@q!~ur  
_b-g^#L%  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Qb>("j~Z  
//{{AFX_MSG_MAP(CCaptureDlg) c_+fA  
 ON_WM_SYSCOMMAND() 6fI2y4yEz  
 ON_WM_PAINT() L?j<KW  
 ON_WM_QUERYDRAGICON() <\Y(+?+uZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 41Q)w=hoN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Et(H6O 8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) j n SZ@u  
//}}AFX_MSG_MAP H' /V<%  
END_MESSAGE_MAP() /j$pV  
(GL'm[V  
BOOL CCaptureDlg::OnInitDialog() SG\ /m'F  
{ YLA(hg|  
 CDialog::OnInitDialog(); Ij.mLO]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lemV&$WN|  
 ASSERT(IDM_ABOUTBOX < 0xF000); Z]TQ+9t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Y%eW6Y#  
 if (pSysMenu != NULL) ':_gYA  
 { X o9vE3  
  CString strAboutMenu;  WTl0}wi  
  strAboutMenu.LoadString(IDS_ABOUTBOX); SSE,G!@  
  if (!strAboutMenu.IsEmpty()) a*D<J}xe  
  { U; <{P  
   pSysMenu->AppendMenu(MF_SEPARATOR); uuF~+=.|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W% Lrp{  
  } =EA @  
 } {Ke IYjE  
 SetIcon(m_hIcon, TRUE); // Set big icon +$(y2F7|u-  
 SetIcon(m_hIcon, FALSE); // Set small icon wA/!A$v(  
 m_Key.SetCurSel(0); uuD2O )v  
 RegisterHotkey(); .*oL@iX  
 CMenu* pMenu=GetSystemMenu(FALSE); 1D8S}=5&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); CPcUB4a%#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %@)q=*=y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ONcLhwH  
 return TRUE; // return TRUE unless you set the focus to a control _eBNbO_J  
} JLoE)\Mi  
R[v<mo[s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L&:A59)1k  
{ 0Qvr g+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) DO*6gzW  
 { ^ /%Y]d$  
  CAboutDlg dlgAbout; 7]5~ml3:  
  dlgAbout.DoModal(); w%)RX<h dI  
 } PyHL`PZZ  
 else iWr #H  
 { +,ar`:x&a  
  CDialog::OnSysCommand(nID, lParam); H\<0{#F  
 } C\BKdx5;  
} yY49JZ  
P(8 uL|^  
void CCaptureDlg::OnPaint() B= E/|J</  
{ 4Y1^ U{A+  
 if (IsIconic()) Vb JE zl  
 { { 6qxg_{  
  CPaintDC dc(this); // device context for painting :PY8)39@K  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9 4lt?|3=  
  // Center icon in client rectangle  (yd(ZY  
  int cxIcon = GetSystemMetrics(SM_CXICON); @zi0:3`#0\  
  int cyIcon = GetSystemMetrics(SM_CYICON); pG)dF@  
  CRect rect; l,b,U/3R.  
  GetClientRect(&rect); ,H/O"%OJ  
  int x = (rect.Width() - cxIcon + 1) / 2; rOEBL|P0  
  int y = (rect.Height() - cyIcon + 1) / 2; :KG=3un]  
  // Draw the icon tCR~z1  
  dc.DrawIcon(x, y, m_hIcon); r<srTHGL o  
 } ^*$!9~  
 else IV':sNV  
 { ~.U \Y  
  CDialog::OnPaint(); hH;i_("i(h  
 } zI S ,N '  
} xnWezO_  
MwSfuP  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0~W XA=XG  
{ Th\T$T`X$  
 return (HCURSOR) m_hIcon; '4u/g  
} &X` lh P  
tK*y/S  
void CCaptureDlg::OnCancel() lcReRcjm  
{ ]=xX_  
 if(bTray) &vN!>bR  
  DeleteIcon(); y ,`0f|  
  CDialog::OnCancel(); |+sAqx1IF  
} p}gA8 o  
B|9XqQ EI  
void CCaptureDlg::OnAbout() xmC5uT6L3M  
{ N z=P1&G'  
 CAboutDlg dlg; LqJV  
 dlg.DoModal(); FS @55mQ  
} @t$yg$Q?[  
gPd ,  
void CCaptureDlg::OnBrowse() if\`M'3Xx  
{ ){,M v:#+T  
 CString str; w}$;2g0=a<  
 BROWSEINFO bi; FrLv%tK|  
 char name[MAX_PATH]; UEYJd&n0CB  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); HP<a'|r  
 bi.hwndOwner=GetSafeHwnd(); u` (yT<>H  
 bi.pszDisplayName=name; FoZI0p?L)9  
 bi.lpszTitle="Select folder"; l>s@&%;Mg  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yn(bW\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F,pKt.x  
 if(idl==NULL) KE5>O1  
  return; xc`O \z_)  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M80O;0N%A  
 str.ReleaseBuffer(); 7aPA+gA/  
 m_Path=str; :h3U^  
 if(str.GetAt(str.GetLength()-1)!='\\') {o*$|4q4  
  m_Path+="\\"; > MRuoJ  
 UpdateData(FALSE); r_tt~|s,>  
} 4sH?85=j  
+eLL)uk  
void CCaptureDlg::SaveBmp() }jWg&<5+z  
{ M5_ t#[ [  
 CDC dc; 368 g> /#'  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); rqm":N8@  
 CBitmap bm; -w)v38iX!  
 int Width=GetSystemMetrics(SM_CXSCREEN); /f+BeQ3#/  
 int Height=GetSystemMetrics(SM_CYSCREEN); hPgYKa8u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); L@Qvj-5e  
 CDC tdc; ?pd /cj^  
 tdc.CreateCompatibleDC(&dc); #RSUChe7w  
 CBitmap*pOld=tdc.SelectObject(&bm); D ZH2U+K  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Hm|N {  
 tdc.SelectObject(pOld); P39oHW  
 BITMAP btm; "<)Jso|  
 bm.GetBitmap(&btm); o^owv(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; m&(qr5>b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v|]"uPxH?  
 BITMAPINFOHEADER bih; n8T'}d+mm  
 bih.biBitCount=btm.bmBitsPixel; Q6 m.yds  
 bih.biClrImportant=0; lU$0e09  
 bih.biClrUsed=0; [[';Hi^  
 bih.biCompression=0; aZtM _  
 bih.biHeight=btm.bmHeight; (q}Li rR  
 bih.biPlanes=1; }:J-o  
 bih.biSize=sizeof(BITMAPINFOHEADER); "K+EZ%~<  
 bih.biSizeImage=size; \&Bdi6xAy  
 bih.biWidth=btm.bmWidth; 9GTp};Kg  
 bih.biXPelsPerMeter=0; 3%Q9521  
 bih.biYPelsPerMeter=0; #@1(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4HGS  
 static int filecount=0; ST g} Z  
 CString name; ^%LyT!y  
 name.Format("pict%04d.bmp",filecount++); ;$4&Qp:#  
 name=m_Path+name; 2hryY  
 BITMAPFILEHEADER bfh; "*MF=VB1  
 bfh.bfReserved1=bfh.bfReserved2=0; vO/3bu}  
 bfh.bfType=((WORD)('M'<< 8)|'B');  AKk&  
 bfh.bfSize=54+size; Wfc~"GQq4  
 bfh.bfOffBits=54; uNw9g<g:V[  
 CFile bf; HRu;*3+%>F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D$NpyF.87  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); X2:23j<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `(I$_RSE")  
  bf.WriteHuge(lpData,size); *uy<Om  
  bf.Close(); O;}K7rSc  
  nCount++; [U"/A1p  
 } JB.U&  
 GlobalFreePtr(lpData); uq54+zC  
 if(nCount==1) tB(~:"|8  
  m_Number.Format("%d picture captured.",nCount); -g|ji.  
 else E8p,l>6(f  
  m_Number.Format("%d pictures captured.",nCount); Mk+G(4p  
  UpdateData(FALSE); +#<Z/  
} M1*bT@ 6  
H?xY S| n  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9ZY,T]ym?  
{ M#m;jJqON  
 if(pMsg -> message == WM_KEYDOWN) N0NFgW;  
 { YB2gxZ  
  if(pMsg -> wParam == VK_ESCAPE) {I?)ODx7qC  
   return TRUE; HXZ,"S  
  if(pMsg -> wParam == VK_RETURN) O.xtY @'"  
   return TRUE; u-mD"  
 } kBoQjOV`  
 return CDialog::PreTranslateMessage(pMsg); %*Uc,V  
} iJmzVR+  
fz2}M:u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E\;%,19Ob  
{ *0Fz." v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _u~0t`f~  
  SaveBmp(); MHye!T6fO\  
  return FALSE; 2\gIjXX"  
} ijzwct#.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8VO]; +N  
 CMenu pop; K(d+t\ca  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~<_WYSzS  
 CMenu*pMenu=pop.GetSubMenu(0); -%^'x&e  
 pMenu->SetDefaultItem(ID_EXITICON); pv-c>8Wb6  
 CPoint pt; N>]J$[j  
 GetCursorPos(&pt); !=a]Awr\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \^RKb-6n  
 if(id==ID_EXITICON) q(~|roKA(  
  DeleteIcon();  jIH^  
 else if(id==ID_EXIT) jiLJiYMg  
  OnCancel(); "dvo@n|  
 return FALSE; hCd? Kti  
} A=p'`]Yld  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \4C[<Gbx$(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u |.7w 2  
 AddIcon(); u*,>$(-u  
 return res; c/v|e&q  
} o; U!{G(X  
N3@[95  
void CCaptureDlg::AddIcon() g-"GZi  
{ c$tX3ug6I  
 NOTIFYICONDATA data; $60`Hh 4/  
 data.cbSize=sizeof(NOTIFYICONDATA); >V)"TZH  
 CString tip; gw[Eu>I  
 tip.LoadString(IDS_ICONTIP); n^O!93a  
 data.hIcon=GetIcon(0); ,u)jZ7  
 data.hWnd=GetSafeHwnd(); H6|eUU[&  
 strcpy(data.szTip,tip); =adHP|S  
 data.uCallbackMessage=IDM_SHELL; IAq o(Qm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0 _MtmmL.  
 data.uID=98; d%-/U!z?  
 Shell_NotifyIcon(NIM_ADD,&data); %d(= >  
 ShowWindow(SW_HIDE); 8"ZS|^#  
 bTray=TRUE; .5}Gt>4XM  
} z0SF2L H  
.Y^cs+-o  
void CCaptureDlg::DeleteIcon() c:>&YGmhu  
{ iR88L&U>  
 NOTIFYICONDATA data; c%gL3kOT  
 data.cbSize=sizeof(NOTIFYICONDATA); Qr 4 D  
 data.hWnd=GetSafeHwnd(); TO"Md["GI  
 data.uID=98; 83gWA>Odh  
 Shell_NotifyIcon(NIM_DELETE,&data); 6o(IL-0]c  
 ShowWindow(SW_SHOW); NRp  
 SetForegroundWindow(); P R3Arfle  
 ShowWindow(SW_SHOWNORMAL); 1# z@D(  
 bTray=FALSE; @|Yn~PwKs  
} ka8Y+Gs  
b.@4yW  
void CCaptureDlg::OnChange() m_@XoS yxI  
{ 0< vJ*z|_  
 RegisterHotkey(); !Hl]&  
} l!&ik9m  
ih^FH>@  
BOOL CCaptureDlg::RegisterHotkey() oZ d3H  
{ ~ &Ne P  
 UpdateData(); Yv@n$W`:  
 UCHAR mask=0; m|c [C\)By  
 UCHAR key=0; GQ7uxdqWBQ  
 if(m_bControl) @p WN5VL  
  mask|=4; dr:x0>  
 if(m_bAlt) g3>>gu#0DC  
  mask|=2; hd~#I<8;2  
 if(m_bShift) vO~  Tx  
  mask|=1; CE c(2q+%i  
  key=Key_Table[m_Key.GetCurSel()]; ]77f`<q<}!  
 if(bRegistered){ 0F/[GZ<k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); VwPoQ9pIS  
  bRegistered=FALSE; "NGfT:HV  
 } [xr^t1  
 cMask=mask; L/C~l3  
 cKey=key; AD?XJ3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M\{\WyeX  
 return bRegistered; shH2/.>  
} js5VgP`  
!3Pmjip  
  四、小结 1Z @sh>X|  
'6&o:t  
  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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