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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: )+P]Vf\jH  
  G{Yz8]m  
  一、实现方法 %FZ2xyI.  
{ZU1x 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: .zg8i_  
\OILWQ[/  
#pragma data_seg("shareddata") asJ!NvVG'  
HHOOK hHook =NULL; //钩子句柄 '1?\/,em  
UINT nHookCount =0; //挂接的程序数目 j.e0;! (L}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 p;T{i._iL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 L< ^j"!0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey wh6yPVVF/  
static int KeyCount =0; Q=mI 9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 oA] KE"T  
#pragma data_seg() $ _j[2EU  
h4|i%,f  
  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。 ]z/Zq  
fKH7xu!V4+  
  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: \Ig68dFf%  
K5Q43 e1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3`E=#ff%  
cKey,UCHAR cMask) pM;vH]|  
{ &H}r%%|A  
 BOOL bAdded=FALSE; Wj|alH9<  
 for(int index=0;index<MAX_KEY;index++){ gr-9l0u  
  if(hCallWnd[index]==0){ Vd^g9  
   hCallWnd[index]=hWnd; dZ#&YG)?e  
   HotKey[index]=cKey; 5 @U<I  
   HotKeyMask[index]=cMask; ^G&3sF}  
   bAdded=TRUE; d) f@ 5/<  
   KeyCount++; <8,o50`B  
   break; "Z Htr<+  
  } \B F*m"lz  
 } [B@'kwD\l  
 return bAdded; '* mH*?Y  
} !+>v[(OzM  
//删除热键 qm/Q65>E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :NJ_n6E  
{ =_$Qtq+h  
 BOOL bRemoved=FALSE; ,B?~-2cCz  
 for(int index=0;index<MAX_KEY;index++){ OsBo+fwT  
  if(hCallWnd[index]==hWnd){ <,o>Wx*1C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z;9>S=w!  
    hCallWnd[index]=NULL; ^b:( jI*l  
    HotKey[index]=0; .2d9?p3Y  
    HotKeyMask[index]=0; :w}{$v}#D;  
    bRemoved=TRUE; T134ZXqqz  
    KeyCount--; ojYbR<jn9  
    break; 'z76 Sa  
   } |*Z$E$k:  
  } Lg8nj< TF  
 } *I}`dC[  
 return bRemoved; 'iLpE7  
} 4tL<q_  
4XVCHs(  
zvABU+{jD  
  DLL中的钩子函数如下: *6HTV0jv  
COH<Tj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J>fQNW!{  
{ mF` B#  
 BOOL bProcessed=FALSE; RMMd#/A@}  
 if(HC_ACTION==nCode) :#dE:L;T  
 { f{SB1M   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @`\VBW  
   switch(wParam) (&/2\0QV  
   {  }VDqj}is  
    case VK_MENU: wFG3KzEq ~  
     MaskBits&=~ALTBIT; *s@Qtgu  
     break; U qG .:@T  
    case VK_CONTROL: {vAE:W.s  
     MaskBits&=~CTRLBIT; $w"$r$K9K  
     break; /cc\fw1+  
    case VK_SHIFT: o7IxJCL=Q  
     MaskBits&=~SHIFTBIT;  hi g2  
     break; [+O"<Ua  
    default: //judge the key and send message GfM;saTz{  
     break; j ";2o(  
   } THmb6^  
   for(int index=0;index<MAX_KEY;index++){ u2 `b'R9  
    if(hCallWnd[index]==NULL) f~ }H  
     continue; !i=nSqW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [M+f-kl  
    { aF03a-qw<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cuOvN"nuNj  
     bProcessed=TRUE; %Uz(Vd#K  
    } =8U&[F  
   } R<B7K?SxV~  
  } 7GDHz.IX  
  else if((lParam&0xc000ffff)==1){ //有键按下 kdGT{2u  
   switch(wParam) ^eW}XRI  
   { J\ e+}{  
    case VK_MENU: JN7k2]{  
     MaskBits|=ALTBIT; N},n `Yl.  
     break; 1q;#VS/D;H  
    case VK_CONTROL: iNMx"F0r  
     MaskBits|=CTRLBIT; 2NB L}x  
     break; qJ0fQI\  
    case VK_SHIFT: )BRKZQN  
     MaskBits|=SHIFTBIT; eh"3NRrN  
     break; lJ@][;  
    default: //judge the key and send message *)+ut(x|#  
     break; Z@hD(MS(C  
   } m&|`x  
   for(int index=0;index<MAX_KEY;index++){ LM2TZ   
    if(hCallWnd[index]==NULL) RT%pDym\  
     continue; sXNb}gJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CbN!1E6).  
    { *Q1~S]g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]9\!;Bz^J  
     bProcessed=TRUE; P./VmY'  
    } {3&|tk!*  
   } QBR=0(giF  
  } Rb\6;i8R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 WJ*n29^N^h  
   for(int index=0;index<MAX_KEY;index++){ 5xii(\lC  
    if(hCallWnd[index]==NULL) D%JlbH8  
     continue; ?McQr1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PTj&3`v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2)j0Ai%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 s3W@WH^.  
   } ak:c rrkx  
  } 7'OtruJ   
 } TRsE %  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ngGO0  
} F{ELSKcp.  
;'-olW~  
  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: D-,L&R!`  
fryJW=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n-DVT;y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); : }`-B0  
-,["c9'3  
  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: Iy }:F8F>g  
2.d|G `  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |{,KRO0P  
{ ^FnfJ:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) '?({;/L  
 { %$TGzK1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c sfgJ^n  
  SaveBmp(); ^ "\R\COQ  
  return FALSE; Oh4AsOj@  
 } , lJ  v  
 …… //其它处理及默认处理 UUMtyf  
} >CkjUZu]&  
DLCkM*'  
;U_QvN|  
  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。 E#s)52z=B  
nVJPR  
  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。 Pzb|t+"$  
MCdx?m3]  
  二、编程步骤 p6vKoI#T  
/y>>JxAEb  
  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"; pAk/Qxl3eo  
[xKd7"d/n  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; iPrLwheb  
N:9>dpP}O  
  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; #]'rz,E<  
san,|yrMn  
  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; r#6_]ep}<'  
w;l<[q?_  
  5、 添加代码,编译运行程序。 Q3"} Hl2  
CA +uKM^"6  
三、程序代码 %8~3M75$  
Q~Z=(rP20  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Vrvic4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 5[Pr|AY  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l{D'uI[&  
#if _MSC_VER > 1000 M2U&?V C!  
#pragma once rLX4jT^  
#endif // _MSC_VER > 1000 YTw#J OO  
#ifndef __AFXWIN_H__ B^^r\L9  
#error include 'stdafx.h' before including this file for PCH L;od6<.*m  
#endif @&}q} D  
#include "resource.h" // main symbols Vi$-Bw$@  
class CHookApp : public CWinApp pBw0"ff  
{ S~Id5T:,  
 public: lvp8z) G  
  CHookApp(); =V^.}WtO  
  // Overrides B7"PIkk;  
  // ClassWizard generated virtual function overrides 7-BvFEM;  
  //{{AFX_VIRTUAL(CHookApp) RW P<B0)  
 public: X_v[MW  
  virtual BOOL InitInstance(); `g,8-  
  virtual int ExitInstance(); G-T0f  
  //}}AFX_VIRTUAL ~0b O}  
  //{{AFX_MSG(CHookApp) Zo{$  
  // NOTE - the ClassWizard will add and remove member functions here. $t/x;< .H  
  // DO NOT EDIT what you see in these blocks of generated code ! #h@J=Ki  
  //}}AFX_MSG V"!G2&  
  DECLARE_MESSAGE_MAP() Y{*u&^0{  
}; r `eU~7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l (3bW1{n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xj*vh m%i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #A8@CA^d  
BOOL InitHotkey(); P/`I.p;  
BOOL UnInit(); 4GB7A]^E  
#endif 5?Wto4j  
gI8Bx]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tbO H#|  
#include "stdafx.h" [7 YPl9  
#include "hook.h" IMk'#)  
#include <windowsx.h> C4NTh}6t T  
#ifdef _DEBUG tBct  
#define new DEBUG_NEW t R6 +G  
#undef THIS_FILE 'u` .P:u?  
static char THIS_FILE[] = __FILE__; {%#)5l)  
#endif "4%"&2L  
#define MAX_KEY 100 *]i!fzI']  
#define CTRLBIT 0x04 5 Qoew9rA  
#define ALTBIT 0x02 !u]1 dxa  
#define SHIFTBIT 0x01 4Yl;  
#pragma data_seg("shareddata") lHV[Ln`\x  
HHOOK hHook =NULL; ?i`l[+G  
UINT nHookCount =0; L_w+y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7+hK~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c=AOkX3UD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LbtX0^  
static int KeyCount =0; 0 &GRPu27  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -)~SM&  
#pragma data_seg() \RVW  
HINSTANCE hins; nbG/c80  
void VerifyWindow(); @X3{x\i'I  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) D13Rx 6b  
//{{AFX_MSG_MAP(CHookApp) rcGb[=Bf  
// NOTE - the ClassWizard will add and remove mapping macros here. 2[gFkyqe  
// DO NOT EDIT what you see in these blocks of generated code!  ykrr2x  
//}}AFX_MSG_MAP ujJI 1I  
END_MESSAGE_MAP() ` }3qhar  
yAN=2fZm  
CHookApp::CHookApp() G"T',~  
{ Z;h<6[(  
 // TODO: add construction code here, [le)P$#z  
 // Place all significant initialization in InitInstance &gI~LP  
} Ssk}e=]  
V i&*&"q  
CHookApp theApp; Qeu\&%C!<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?h!i0Rsm  
{ }za[E>z  
 BOOL bProcessed=FALSE; *|_"W+JC  
 if(HC_ACTION==nCode) Z/ Tm)Xd  
 { ?<* -j4v  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9 fMau  
   switch(wParam) 2!Bd2  
   { n$[f94d=  
    case VK_MENU: DD44"w_9  
     MaskBits&=~ALTBIT; 5Q=P4w!'  
     break; Pf F=m'  
    case VK_CONTROL: ]x&u`$F  
     MaskBits&=~CTRLBIT; z5bo_Eq  
     break; s :`8ZBz~  
    case VK_SHIFT: Cg616hyut  
     MaskBits&=~SHIFTBIT; 3 v")J*t  
     break; }$\M{# C~  
    default: //judge the key and send message ?EX"k+G  
     break; MC,>pR{  
   } u`(- -  
   for(int index=0;index<MAX_KEY;index++){ .Gcy> Av  
    if(hCallWnd[index]==NULL) +`uY]Q ,O  
     continue; ^;c16  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vzn{h)D  
    { ,/O[=9l36R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v2,%K`pAU  
     bProcessed=TRUE; QKE9R-K TE  
    } +-B^Z On  
   } z_ =Bt  
  } zS< jd~  
  else if((lParam&0xc000ffff)==1){ //Key down 2Dd|~{%  
   switch(wParam) <[GYLN[0Q  
   { L>Mpi$L  
    case VK_MENU: C%~a`e|/Y  
     MaskBits|=ALTBIT; wZh:F !  
     break; Bb{!Yh].:A  
    case VK_CONTROL: >*$;  
     MaskBits|=CTRLBIT; GjB]KA^  
     break; ?m c%.Bt  
    case VK_SHIFT: it2 a  
     MaskBits|=SHIFTBIT; rfw-^`&{  
     break; wC-Rr^q  
    default: //judge the key and send message tDDy]==E  
     break; G4 G5PXi  
   } -{ u*qtp  
   for(int index=0;index<MAX_KEY;index++) N S#TW  
   { !Oi~:Pp  
    if(hCallWnd[index]==NULL) +PK6-c\r  
     continue; ,p;_\\<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V Yw%01#  
    { IcIOC8WC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2 3KyCV5  
     bProcessed=TRUE; A?Wk  w f  
    } \(p{t  
   } ,_ag;pt9)  
  } |Oag,o"  
  if(!bProcessed){ p h[\)  
   for(int index=0;index<MAX_KEY;index++){ !6}O.Nu  
    if(hCallWnd[index]==NULL) L_em')  
     continue; h O emt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?GBkqQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); joul<t-  
   } //Ai.Q.J[  
  } Gs2p5nL<  
 } 3/JyUh?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [\R>Xcu>  
} u-"c0@  
s/Xb^XjS1  
BOOL InitHotkey() [Vdz^_@Y  
{ wve=.n  
 if(hHook!=NULL){ m+ itno  
  nHookCount++; X bkb5EkA  
  return TRUE; (Vg}Hh?p  
 } Q)af|GW$  
 else {0!#>["<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); OlD`uA  
  if(hHook!=NULL) X5 ITF)&  
   nHookCount++; ^/Sh=4=G  
  return (hHook!=NULL); CVXytS?@x  
} #=}$OFg  
BOOL UnInit() &W }<:WH~  
{ ^6p'YYj"5  
 if(nHookCount>1){ ~2 u\  
  nHookCount--; mDFlz1J,e  
  return TRUE; 2=ztKfsBhE  
 }  8RwX=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t5 a7DD  
 if(unhooked==TRUE){ @tRMe6 4  
  nHookCount=0; ~YCuO0t  
  hHook=NULL; >6Lm9&}  
 } Fl>]&x*~  
 return unhooked; 7m5Co>NkuK  
} dRvin[R8  
y33~HsOJ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;1DdjETr  
{ #~qAHJ<  
 BOOL bAdded=FALSE; =neL}Fav56  
 for(int index=0;index<MAX_KEY;index++){ GJ 'spgz  
  if(hCallWnd[index]==0){ y|_Eu:  
   hCallWnd[index]=hWnd; OY"6J@[z  
   HotKey[index]=cKey; ZkB3[$4C=5  
   HotKeyMask[index]=cMask; P,bd'  
   bAdded=TRUE;  +f4W"t  
   KeyCount++; ;+pOP |P=  
   break; OuIv e>8  
  } #G3N(wV3  
 } 6Gn4asoA  
 return bAdded; > 7`&0?  
} f"&Xr!b.h  
/&ygiH{^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;mAhY  
{ }1+%_|Y-E  
 BOOL bRemoved=FALSE; DlE_W+F  
 for(int index=0;index<MAX_KEY;index++){ e<gx~N9l'  
  if(hCallWnd[index]==hWnd){ GIHpSy`z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'PdmI<eXQ  
    hCallWnd[index]=NULL; '~-IV0v9  
    HotKey[index]=0; !D.0 (J  
    HotKeyMask[index]=0; j nwQV  
    bRemoved=TRUE; E@ h y7X  
    KeyCount--; l54|Q  
    break; FquFRx  
   } Tvf~P w  
  } (*l2('e#@  
 } ~tm0QrJn/  
 return bRemoved; ST8!i`Q$  
} 7y*ZXT]f  
k3@HI|  
void VerifyWindow() VGH/X.NJ  
{ <rK=9"$y(t  
 for(int i=0;i<MAX_KEY;i++){ fAj2LAK  
  if(hCallWnd!=NULL){ qg,Nb  
   if(!IsWindow(hCallWnd)){ zXc}W*ymj  
    hCallWnd=NULL; xQt 3[(Z  
    HotKey=0; a}.Y!O&  
    HotKeyMask=0; :\V,k~asl  
    KeyCount--; ]@xL=%   
   } m[2'd  
  } S-E++f9D~  
 } 6 o[/F3`  
} ,&a`d}g&G  
)wf\F6jN  
BOOL CHookApp::InitInstance() p4/$EPt)lY  
{ E*v]:kok  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tGqCt9;<  
 hins=AfxGetInstanceHandle(); & QZVq"  
 InitHotkey(); Nh)[r x  
 return CWinApp::InitInstance(); ekzjF\!y  
} Go+[uY^  
`n-vjjG%#  
int CHookApp::ExitInstance() ?=|kC*$/G  
{ F>Y9o- o2  
 VerifyWindow(); /B HepD}  
 UnInit(); Di??Q_$ak  
 return CWinApp::ExitInstance(); f?0s &Xo  
} k7bl'zic  
lg/sMF>z\f  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q=Xg*PM,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A1JzW)B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _dmL}t-  
#if _MSC_VER > 1000 q9}2  
#pragma once shi Hy*(v  
#endif // _MSC_VER > 1000 dl/X."iv!  
2Ug.:![  
class CCaptureDlg : public CDialog kG3!(?:  
{ r#~K[qb  
 // Construction dm^H5D/A  
 public: U'3Fou}  
  BOOL bTray; +0#JnqH"  
  BOOL bRegistered; Hql5oA  
  BOOL RegisterHotkey(); `facFt[\  
  UCHAR cKey; [n:PNB  
  UCHAR cMask; <%,'$^'DS  
  void DeleteIcon(); ZC\mxBy  
  void AddIcon(); $Qq_qTJu?G  
  UINT nCount;  ~u/@rqF  
  void SaveBmp(); FP;": iRL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Yk>8g;<  
  // Dialog Data {,V$*  
  //{{AFX_DATA(CCaptureDlg) @P70W<<  
  enum { IDD = IDD_CAPTURE_DIALOG }; OJ[rj`wrW^  
  CComboBox m_Key; A +!sD5d  
  BOOL m_bControl; Gc5VQ^]  
  BOOL m_bAlt; <:cpz* G4  
  BOOL m_bShift; h;n\*[fDc  
  CString m_Path; R@ QQNYU.D  
  CString m_Number; :_c*m@=z(  
  //}}AFX_DATA 0!IPcZjY7  
  // ClassWizard generated virtual function overrides |a(Q4 e/,  
  //{{AFX_VIRTUAL(CCaptureDlg) ]GS ~i+=M  
 public: RSH/l;ii  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;F,qS0lzE  
 protected: !"(u_dFw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8?Wgawx  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |4xo4%BQ>  
  //}}AFX_VIRTUAL 4hNwKe"Ki  
  // Implementation aiR5/ ZD  
 protected: .wri5  
  HICON m_hIcon; H0tF  
  // Generated message map functions 8m7eaZ  
  //{{AFX_MSG(CCaptureDlg) /Su)|[/'  
  virtual BOOL OnInitDialog(); zv9M HC &  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "w^Nu6  
  afx_msg void OnPaint(); & >b+loF  
  afx_msg HCURSOR OnQueryDragIcon(); _sm;HH7'*  
  virtual void OnCancel(); fIEw(k<*  
  afx_msg void OnAbout(); BA`:miH<  
  afx_msg void OnBrowse(); UG=I~{L  
  afx_msg void OnChange(); #L1>dHhat  
 //}}AFX_MSG FAd``9kRT  
 DECLARE_MESSAGE_MAP() x)\V lR  
}; '{^8_k\}B  
#endif 5\?3$<1 I  
>e_%M5 0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^teaJy%  
#include "stdafx.h" CSH`pU  
#include "Capture.h" d"!yD/RD  
#include "CaptureDlg.h" l qXc  
#include <windowsx.h> 4[_L=zD  
#pragma comment(lib,"hook.lib") D@5s8xv  
#ifdef _DEBUG aL 8Gnqf2  
#define new DEBUG_NEW ;&7,7 3!  
#undef THIS_FILE .S6ji~;r  
static char THIS_FILE[] = __FILE__; 9RB`$5F ;  
#endif '2wCP EC  
#define IDM_SHELL WM_USER+1 mLULd}g/o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4n4j=x]@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wVQdUtmk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :r^klJ(m  
class CAboutDlg : public CDialog  9^p32G  
{ @jKDj]\  
 public: ,N0uR@GN  
  CAboutDlg(); )8bFGX7|  
  // Dialog Data @bY?$fj_u  
  //{{AFX_DATA(CAboutDlg) c G*(C  
  enum { IDD = IDD_ABOUTBOX }; 5Fr;  
  //}}AFX_DATA A~XOK;sB  
  // ClassWizard generated virtual function overrides >.LgsMRIKi  
  //{{AFX_VIRTUAL(CAboutDlg) dWjx"7^  
 protected:  /+N|X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >.n;mk  
  //}}AFX_VIRTUAL ennR@pg  
  // Implementation ?Oqzd$-  
 protected: V 1*Ad  
  //{{AFX_MSG(CAboutDlg) 44Q9* ."  
  //}}AFX_MSG U~CdU  
  DECLARE_MESSAGE_MAP() ki`8(u6l  
}; H)`@2~Y  
6#O#T;f)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /'mrDb_ip  
{ _o&94&  
 //{{AFX_DATA_INIT(CAboutDlg) {&0mK"z_  
 //}}AFX_DATA_INIT 6SV7\,2M  
} /=q.tDH=I  
Hw y5G ;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z'T=]- D  
{ NWb} OXK/  
 CDialog::DoDataExchange(pDX); TbMdQbj}  
 //{{AFX_DATA_MAP(CAboutDlg) HLM;EZ  
 //}}AFX_DATA_MAP _/ct=  
} pFEZDf}:  
\WiqN*ZF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q:pzL "bT  
 //{{AFX_MSG_MAP(CAboutDlg) M5F(<,n;  
 // No message handlers gA{'Q\  
 //}}AFX_MSG_MAP ka!Bmv)  
END_MESSAGE_MAP() -}E)M}W  
Ri; =aZ5m  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l 4!kxXf-<  
: CDialog(CCaptureDlg::IDD, pParent) [7'#~[a~  
{ @81-kdTx  
 //{{AFX_DATA_INIT(CCaptureDlg) sRi?]9JIl  
  m_bControl = FALSE; _O"L1Let  
  m_bAlt = FALSE; C1KfXC*|L  
  m_bShift = FALSE; Q js2hj-$  
  m_Path = _T("c:\\"); Sf=F cb  
  m_Number = _T("0 picture captured."); c%ZeX%p  
  nCount=0; E(% XVr0W  
  bRegistered=FALSE; AfUZO^<  
  bTray=FALSE; qQL.c+%L  
 //}}AFX_DATA_INIT Ap% d<\,Z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7Pwg+|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qw|JJ  
} o>@=N2n  
sZ]'DH&_(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RzpC1nd  
{ sTt9'P`  
 CDialog::DoDataExchange(pDX); jYrym-  
 //{{AFX_DATA_MAP(CCaptureDlg) 0{-`Th+h  
  DDX_Control(pDX, IDC_KEY, m_Key); `0Yt1Z&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `b#/[3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `'*F 1F  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); kxygf9I!;  
  DDX_Text(pDX, IDC_PATH, m_Path); qx Wgt(Os  
  DDX_Text(pDX, IDC_NUMBER, m_Number); IY V-*/ |  
 //}}AFX_DATA_MAP 3\7'm]  
} HmhUc,EC  
/X@7ju;   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :-w@^mli  
//{{AFX_MSG_MAP(CCaptureDlg) #m[vn^8B]y  
 ON_WM_SYSCOMMAND() @55bE\E?@  
 ON_WM_PAINT() ^I@ey*$  
 ON_WM_QUERYDRAGICON() ]Mn&76 fu  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ==nYe { 2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wu;7NatHx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +d@v AxP  
//}}AFX_MSG_MAP giaD9$C  
END_MESSAGE_MAP() sk~za  
?hxK/%)  
BOOL CCaptureDlg::OnInitDialog() TG4\%S$w  
{   YfTd  
 CDialog::OnInitDialog(); 'uPxEu4 >4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Sc%aJ1  
 ASSERT(IDM_ABOUTBOX < 0xF000); /z/hUa  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *Hx j_  
 if (pSysMenu != NULL) \nC5 ,Rz  
 { Uy(vELB  
  CString strAboutMenu; 6lN?)<uQ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8rGl&  
  if (!strAboutMenu.IsEmpty()) axWM|Bw<+  
  { mG>T`c|r3  
   pSysMenu->AppendMenu(MF_SEPARATOR); o,g6JTh  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 's=Q.s  
  } `kqT{fs  
 } d|>9rX+f  
 SetIcon(m_hIcon, TRUE); // Set big icon c zZrP"  
 SetIcon(m_hIcon, FALSE); // Set small icon I h5/=_n  
 m_Key.SetCurSel(0); W3FymCI  
 RegisterHotkey(); qRgK_/[]  
 CMenu* pMenu=GetSystemMenu(FALSE); D_O5k|-V  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); en Pzy:C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yonJd  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); v>JB rIb$  
 return TRUE; // return TRUE unless you set the focus to a control )EhTM-1  
} "g x5XW&  
@:S$|D~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yfPCGCOW?  
{ H%*~l  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^ze@#Cp  
 { @uQ%o%Ru6  
  CAboutDlg dlgAbout; r$b:1C~  
  dlgAbout.DoModal(); !JT< (I2  
 } gUks O!7^1  
 else Rg%R/p)C  
 { hp?ad  
  CDialog::OnSysCommand(nID, lParam); &i4 (s%z#  
 }  rE/}hHU  
} j)6@q@P/  
Ytl:YzXCi  
void CCaptureDlg::OnPaint() o@qN#Mg?>}  
{ F@>w&A ~K  
 if (IsIconic()) =_#ye}E  
 { h-z%C6  
  CPaintDC dc(this); // device context for painting +}Qv6s#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E`oSi ez)  
  // Center icon in client rectangle ZkJY.H-F  
  int cxIcon = GetSystemMetrics(SM_CXICON); &>d:ewM\  
  int cyIcon = GetSystemMetrics(SM_CYICON); $=\oJ-(!@S  
  CRect rect; @qg0u#k5  
  GetClientRect(&rect); ~0VwF  
  int x = (rect.Width() - cxIcon + 1) / 2; I>N-95  
  int y = (rect.Height() - cyIcon + 1) / 2; *D,v>(  
  // Draw the icon [,\'V0  
  dc.DrawIcon(x, y, m_hIcon); FiV^n6-F`  
 } R*JOiVAC  
 else N&R '$w  
 { U92B+up-  
  CDialog::OnPaint(); f9h:"Dnzin  
 } OGSEvfW  
} UMHuIA:%U  
m _t(rn~f6  
HCURSOR CCaptureDlg::OnQueryDragIcon() |_Naun=+~  
{ 9b{g+lMZo  
 return (HCURSOR) m_hIcon; "2y7&#l   
} iqU.a/~y  
!nP8ysB  
void CCaptureDlg::OnCancel() cHqvkN`  
{ TzD:bKE&  
 if(bTray) o=a:L^nt,  
  DeleteIcon(); 7?kXgR[#d  
  CDialog::OnCancel(); #Pe\Z/  
} kphy7> Km  
zJB+C=]D7H  
void CCaptureDlg::OnAbout() ,g<>`={kK+  
{ ^L*VW gi9  
 CAboutDlg dlg; EvGUj$  
 dlg.DoModal(); -9tXv+v?  
} 4YU1Kr4  
!5g)3St  
void CCaptureDlg::OnBrowse() 4wM$5  
{ sT;=7 L<TA  
 CString str; D{&+7C:8.  
 BROWSEINFO bi; L!G9O]WB  
 char name[MAX_PATH]; ^>P@5gcoE(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _umO)]Si  
 bi.hwndOwner=GetSafeHwnd(); 2vk8+LA(6  
 bi.pszDisplayName=name; MJ*oeI!.=  
 bi.lpszTitle="Select folder"; 'vf,T4uQ"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; NO0[`jy(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ey9fbS ^I  
 if(idl==NULL) 6`$,-(J=  
  return; EF_h::A_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {ra Esb-X  
 str.ReleaseBuffer(); -\sKSY5{R  
 m_Path=str; ?j^?@%f0  
 if(str.GetAt(str.GetLength()-1)!='\\') `*uuB;  
  m_Path+="\\"; Og%zf1)aZM  
 UpdateData(FALSE); H)?" 8 s  
} egIS rmL+X  
34O+#0<y~  
void CCaptureDlg::SaveBmp() f|[5&,2<  
{ w oY)G7%  
 CDC dc; ZT3jxwe  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); U_zpLpm^  
 CBitmap bm; ' /@!"IXz  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;4O;74`Zh  
 int Height=GetSystemMetrics(SM_CYSCREEN); a#^4xy:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )}zA,FOA*  
 CDC tdc; W4] 0qp`\  
 tdc.CreateCompatibleDC(&dc); 0ghwFo  
 CBitmap*pOld=tdc.SelectObject(&bm); se*pkgWbz  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'Rar>oU  
 tdc.SelectObject(pOld); H'0J1\ h  
 BITMAP btm; (cqA^.Td  
 bm.GetBitmap(&btm); RIVN>G[;L  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; e[py J.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9N3oVHc?  
 BITMAPINFOHEADER bih; .Q6{$Y%l  
 bih.biBitCount=btm.bmBitsPixel; '!|E+P-  
 bih.biClrImportant=0; ZP G8q  
 bih.biClrUsed=0; "78cl*sD  
 bih.biCompression=0; A.'`FtV  
 bih.biHeight=btm.bmHeight; hTNYjXj  
 bih.biPlanes=1; 7UEy L }N  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1J!tcj1(  
 bih.biSizeImage=size; 5G]#'tu  
 bih.biWidth=btm.bmWidth; (*^E7 [w  
 bih.biXPelsPerMeter=0; zqE8PbU0M;  
 bih.biYPelsPerMeter=0; ^Qb!k/$3y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KG./<"c  
 static int filecount=0; s-YV_  
 CString name; h 19.b:JT  
 name.Format("pict%04d.bmp",filecount++); 4j=@}!TBt  
 name=m_Path+name; #@OKp,LJ  
 BITMAPFILEHEADER bfh; |H|eH~.yg&  
 bfh.bfReserved1=bfh.bfReserved2=0; V'| g  
 bfh.bfType=((WORD)('M'<< 8)|'B'); a!6OE"?QQ  
 bfh.bfSize=54+size; iz|9a|k6x  
 bfh.bfOffBits=54; *dn-,Q%`  
 CFile bf; 8aM% 9OU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SUQ}^gn]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Vm5P@RU$w;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =<tJAoVV  
  bf.WriteHuge(lpData,size); -:1Gr8  
  bf.Close(); w]}cB+C+l#  
  nCount++; JeSkNs|vB  
 } 5;KT-(q~  
 GlobalFreePtr(lpData); ;lPhSkD  
 if(nCount==1) "r `6c0Z  
  m_Number.Format("%d picture captured.",nCount); -B++V  
 else Z;> aW;Wt  
  m_Number.Format("%d pictures captured.",nCount); BDm H^`V  
  UpdateData(FALSE); u/{_0-+P  
} U=*q;$L#  
zw;(:fgY#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M`g Kt (3  
{ ,;- cz-,  
 if(pMsg -> message == WM_KEYDOWN) Z~R/ p;@  
 { ki/Lf4  
  if(pMsg -> wParam == VK_ESCAPE) fVe-esAw  
   return TRUE; sC*E;7gT,  
  if(pMsg -> wParam == VK_RETURN) [}g5Z=l  
   return TRUE; ]KII?{ <k  
 } xVmUmftD  
 return CDialog::PreTranslateMessage(pMsg); u*YuU%H=  
} L bK1CGyA  
K {N;k-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hQRc,d6x5  
{ Q?'W >^*J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &I">{J<  
  SaveBmp(); oGjYCVc  
  return FALSE; Y&Nv>o_}5  
} Z-r0 D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gZuR4Ti  
 CMenu pop; N pIlQaMo4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F u=VY{U4  
 CMenu*pMenu=pop.GetSubMenu(0); i3\oy`GJ  
 pMenu->SetDefaultItem(ID_EXITICON); G}OrpPP  
 CPoint pt; 6/[h24d  
 GetCursorPos(&pt); Q0cf]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <@2?2l+`X  
 if(id==ID_EXITICON) \>CBam8d  
  DeleteIcon(); wB 0WR  
 else if(id==ID_EXIT) ^{,}, i  
  OnCancel(); GTX&:5H\t  
 return FALSE; (IWd?,H,n  
} e @MCumc~+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); X!'Xx8  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @!tmUme1c  
 AddIcon(); 2/W0y!qh1  
 return res; e&I.kC"j6  
} wZolg~dg  
!Kn+*'#  
void CCaptureDlg::AddIcon() cF6@.)  
{ (>% Vj  
 NOTIFYICONDATA data; )FiU1E  
 data.cbSize=sizeof(NOTIFYICONDATA); .St h  
 CString tip; %JU23c*  
 tip.LoadString(IDS_ICONTIP); a*@Z^5f  
 data.hIcon=GetIcon(0); I Q`aDo-V  
 data.hWnd=GetSafeHwnd(); m<;" 1<k  
 strcpy(data.szTip,tip); o`]FH _  
 data.uCallbackMessage=IDM_SHELL; +Gs;3jC^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; H0:6zSsc=|  
 data.uID=98; ? 9M+fi  
 Shell_NotifyIcon(NIM_ADD,&data); 6#-; ,2i  
 ShowWindow(SW_HIDE); 7 @Qlp$[F  
 bTray=TRUE; CHSD 8D  
} 'Z%aBCM  
= ft$j  
void CCaptureDlg::DeleteIcon() w4/)r-Z4I  
{ R3 =E?us!  
 NOTIFYICONDATA data; Pg}G4L?H;J  
 data.cbSize=sizeof(NOTIFYICONDATA); E<_6O Cz  
 data.hWnd=GetSafeHwnd(); c8 fb)`,k  
 data.uID=98; w'j]Y%  
 Shell_NotifyIcon(NIM_DELETE,&data);  [?(W7  
 ShowWindow(SW_SHOW); O-m}P  
 SetForegroundWindow(); =njj.<BO  
 ShowWindow(SW_SHOWNORMAL); x}24?mP  
 bTray=FALSE; um4zLsd#v  
} h*'5h!  
VZl0)YLK  
void CCaptureDlg::OnChange() / S^m!{  
{ J*k=|+[  
 RegisterHotkey(); >I ; #BE3  
} u8\QhUk'G  
eJdQ7g[>  
BOOL CCaptureDlg::RegisterHotkey() X'p%$HsMG  
{ [aUT #  
 UpdateData(); T7X2$ '  
 UCHAR mask=0; u01^ABn  
 UCHAR key=0; 5q*~h4=r7  
 if(m_bControl) N>iCb:_ T;  
  mask|=4; D($UbT-v  
 if(m_bAlt) *m/u3.\  
  mask|=2; PhdL@Mr  
 if(m_bShift) BAed [  
  mask|=1; `{[C4]Ew/  
  key=Key_Table[m_Key.GetCurSel()]; >sY+Y22U  
 if(bRegistered){ ;Q 6e&Ips/  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3 +9|7=d  
  bRegistered=FALSE; ;0{*V5A  
 } KPrxw }P  
 cMask=mask; G->@   
 cKey=key; $fG/gYvI\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8hV:bz"  
 return bRegistered; k!rz8S"  
} JB}h }nb  
WWs>@lCK  
  四、小结 LB0=V0|  
2)]*re)  
  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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