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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: 9Po>laT 5  
  ~d*Q{v~3  
  一、实现方法 AD;m[u7  
:Drf]D(sMX  
  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: '5}hm1,  
;~3;CijJ8  
#pragma data_seg("shareddata") 2/SUEnaLy_  
HHOOK hHook =NULL; //钩子句柄 "8QRYV~Z  
UINT nHookCount =0; //挂接的程序数目 =!Ik5LiD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {i>AQ+z61f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !@C-|=9G  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Zpd-ob  
static int KeyCount =0; 'o='Q)Dk  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E:` _P+2p  
#pragma data_seg() T;u;r@R/  
P@y)K!{Nk  
  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。 &r,vD,  
Zma;An6  
  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: C(>!?-.  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L7ae6#5.  
cKey,UCHAR cMask) )xp3 ElH  
{  Wvb ~j  
 BOOL bAdded=FALSE; |s /)lA:9  
 for(int index=0;index<MAX_KEY;index++){ ,Uh^e]pC  
  if(hCallWnd[index]==0){ {OG1' m6=/  
   hCallWnd[index]=hWnd; `;mgJD  
   HotKey[index]=cKey; &Wy>t8DIK  
   HotKeyMask[index]=cMask; 7-3  
   bAdded=TRUE; r'noB<| e  
   KeyCount++; Y`g O:d8  
   break; (XK,g;RoEn  
  } P`rfDQoZ  
 } .1(_7!m@  
 return bAdded; 6+=_p$crMx  
} !\b-Ot(  
//删除热键 j32*9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) taDe^Ist j  
{ 8{Wl   
 BOOL bRemoved=FALSE; +B{u,xgg  
 for(int index=0;index<MAX_KEY;index++){ ybpOk  
  if(hCallWnd[index]==hWnd){ ) [eTZg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _J*l,]}S  
    hCallWnd[index]=NULL; qt:B]#j@  
    HotKey[index]=0; xst-zfkH`  
    HotKeyMask[index]=0; 5$i(f8*  
    bRemoved=TRUE; u.E>d9  
    KeyCount--; r?KRK?I  
    break; 0Hrvr  
   } hq"n RH  
  } rzdQLan  
 } qFVZhBC  
 return bRemoved; Vc0j)3  
} 1<:5b%^c  
&wQ<sVQ0$  
V 2Xv)  
  DLL中的钩子函数如下: Zl[EpXlZ  
"tT4Cb3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) PU%Zay  
{ R(t%/Hvs$  
 BOOL bProcessed=FALSE; *vQ 6LF;y  
 if(HC_ACTION==nCode) =pzTB-G  
 { 42e[OG-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 lP=,|xFra  
   switch(wParam) J"#6m&R_q  
   {  )P? 0YC  
    case VK_MENU: xM{[~Kh_x  
     MaskBits&=~ALTBIT; ,7$&gx>2&  
     break; }S"gZ6   
    case VK_CONTROL: Q>[{9bI4QP  
     MaskBits&=~CTRLBIT; >'n[B    
     break; AK lr a$  
    case VK_SHIFT:  Z/Wf  
     MaskBits&=~SHIFTBIT; |Ja5O  
     break; qo:Zc`t(R  
    default: //judge the key and send message {^ BZ#)m|  
     break; zEjl@Kf  
   } ys!O"=OJ  
   for(int index=0;index<MAX_KEY;index++){ Dh m ;K$T  
    if(hCallWnd[index]==NULL) 4~Q<LEly  
     continue; p7+>]sqX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !pfpT\i]N:  
    { C!_=L?QT^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?Kmz urG  
     bProcessed=TRUE; g3s5ra[  
    } wg_Z@iX  
   } ((?"2 }1r  
  } _R0O9sPTO  
  else if((lParam&0xc000ffff)==1){ //有键按下 Zk7!CJVM  
   switch(wParam) ;=0-B&+v  
   { P:J|![   
    case VK_MENU: }A6z%|d  
     MaskBits|=ALTBIT; G;u 6p  
     break; 3]iw3M  
    case VK_CONTROL: f7zB_hVDmE  
     MaskBits|=CTRLBIT; V(XU^}b#  
     break; Mmgm6{  
    case VK_SHIFT: Ce//; Op  
     MaskBits|=SHIFTBIT; @@a#DjE%/  
     break; Bd*Ok]  
    default: //judge the key and send message f x:vhEX  
     break; -~sW@u)O  
   } MF$Dx| Tcj  
   for(int index=0;index<MAX_KEY;index++){ N) jNvzm  
    if(hCallWnd[index]==NULL) J*ofa>  
     continue; O*2{V]Y @  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c.Izm+9k  
    { I+Y Z+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N f?\O@  
     bProcessed=TRUE; ui"`c%2n  
    } o7gZc/?n  
   } LvGo$f/9  
  } 3Zz_wr6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ld%#.~Q  
   for(int index=0;index<MAX_KEY;index++){ a@_n>$LZL  
    if(hCallWnd[index]==NULL) l"&iSq!3=  
     continue; 79Aa~+i'_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) H>\l E2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :3se/4y}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }WR@%)7ay  
   } yqJ>Z%)hf  
  } gjJ:s,Fg  
 } rIyIZWkI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ee<'j~{A  
} 7wrRIeES  
3nq4Y'  
  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: AgDXpaq  
svC m }`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B|>eKI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %Zeb#//Jz  
G{+zKs}~  
  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: 3E@ &  
_Fkb$NJ"]Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @q|c|X:I  
{ +>tSO!}[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p%Ns f[1>  
 { I'J-)D`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 x` 4|^ u  
  SaveBmp(); 6m9\0)R  
  return FALSE; e{Mkwi+j  
 } 2 I.Q-'@  
 …… //其它处理及默认处理 0sq?>$~Kc*  
} uY&t9L8  
w\JTMS$  
&61h*s  
  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。 -9 |)O:  
4?`*# DPl  
  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%i`}T%(  
p13y`sU=  
  二、编程步骤 ^Y"|2 :  
oPxh+|0?  
  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"; I_`$$-|  
2N&S__  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; q' t"  
@Bsvk9}  
  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; J32"Ytdo<  
RHI?_gf&  
  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; y<ZT~e  
dY?>:ce  
  5、 添加代码,编译运行程序。 1mv8[^pF  
/p{$HkVw  
三、程序代码 \NL*$SnxP  
T#YJ5Xw  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F@xKL;'N74  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |x ir93|  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9+'*  
#if _MSC_VER > 1000 z7JhS|  
#pragma once 8$ _8Yva"e  
#endif // _MSC_VER > 1000 _.GHtu/I  
#ifndef __AFXWIN_H__ 0[-@<w ^j  
#error include 'stdafx.h' before including this file for PCH `9DW}  
#endif cw;TIx_q  
#include "resource.h" // main symbols \`?4PQ  
class CHookApp : public CWinApp |zp}u(N  
{ @(m?j1!M  
 public: ZY)&Fam}  
  CHookApp(); 6 Znt   
  // Overrides {u$<-W-&  
  // ClassWizard generated virtual function overrides l Ztw[c  
  //{{AFX_VIRTUAL(CHookApp) _WBWFGj  
 public: 0w".o!2\U{  
  virtual BOOL InitInstance(); {G-y7y+E  
  virtual int ExitInstance(); iB*1Yy0DC  
  //}}AFX_VIRTUAL tIW~Ng  
  //{{AFX_MSG(CHookApp) j[$+hh3:  
  // NOTE - the ClassWizard will add and remove member functions here. RAoY`AWI  
  // DO NOT EDIT what you see in these blocks of generated code ! q:P44`Aq  
  //}}AFX_MSG rVb61$  
  DECLARE_MESSAGE_MAP() }ho6  
}; B|kIiL63 D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q!) nSD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A{wSO./3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5eX+9niY  
BOOL InitHotkey(); 7;ddzxR4  
BOOL UnInit(); u/HNXJ7M`9  
#endif 1v9 #Fr Y  
<)$JA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q} p (p( N  
#include "stdafx.h" z4s{a(Tsd  
#include "hook.h" 26-K:"  
#include <windowsx.h> bSk)GZyH\d  
#ifdef _DEBUG $G#)D^-5G  
#define new DEBUG_NEW +Y440Tz  
#undef THIS_FILE Y#oY'S .;y  
static char THIS_FILE[] = __FILE__; wN$u^]  
#endif NU%W9jQYS  
#define MAX_KEY 100 4u]>$?X1_  
#define CTRLBIT 0x04 %H7H0 %qW  
#define ALTBIT 0x02 ]]V| ]}<)m  
#define SHIFTBIT 0x01 g$9s} \6B  
#pragma data_seg("shareddata") KiMEd373-  
HHOOK hHook =NULL; &}b-aAt  
UINT nHookCount =0; g:[yA{Eh  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T3/Gl 6f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0 t0m?rVW  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l\t<_p/I)^  
static int KeyCount =0; dQPW9~g8Hg  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift HA GpM\Qa  
#pragma data_seg() @l&>C#K\  
HINSTANCE hins; w*IDL0#  
void VerifyWindow(); X[$FjKZh=F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L[}Ak1 A  
//{{AFX_MSG_MAP(CHookApp) 6cTd SE  
// NOTE - the ClassWizard will add and remove mapping macros here. Eh.NJI(  
// DO NOT EDIT what you see in these blocks of generated code! @l@erCw@  
//}}AFX_MSG_MAP +r 8/\'u-  
END_MESSAGE_MAP() ?&$BQK  
hdy N   
CHookApp::CHookApp() -e_L2<7  
{ E3 aj  
 // TODO: add construction code here, "S0WFP\P+  
 // Place all significant initialization in InitInstance ??? ;H  
} +IbQVU~/  
ivP#qM1*;  
CHookApp theApp; j# !U6T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p7]V1w:  
{ sEEyN3 N  
 BOOL bProcessed=FALSE;  z-;{pPZ  
 if(HC_ACTION==nCode) 5VK.Zs\  
 { 69EdMuf  
  if((lParam&0xc0000000)==0xc0000000){// Key up )\fLS d  
   switch(wParam) "' ]|o~B  
   { c>yqq'  
    case VK_MENU: //- ;uEO  
     MaskBits&=~ALTBIT; U<.,"`=l  
     break; $g]'$PB  
    case VK_CONTROL: (b;*8  
     MaskBits&=~CTRLBIT; 'mE!,KeS;  
     break; t(5PKD#~Dc  
    case VK_SHIFT: Zf8_ko;|:-  
     MaskBits&=~SHIFTBIT; 6,Y<1b*|Vo  
     break; VgcLG ]tE[  
    default: //judge the key and send message l5CFm8%  
     break; x10u?@  
   } "'*w_H0  
   for(int index=0;index<MAX_KEY;index++){ Ggp.%kS6F  
    if(hCallWnd[index]==NULL) J=AF`[  
     continue; <%:,{u6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  @1O.;  
    { VL| q`n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +|TFxaVz  
     bProcessed=TRUE; RP~ hi%A  
    } Eh/Z4pzT  
   } eaCh;IpIf  
  } !5=S 2<UX  
  else if((lParam&0xc000ffff)==1){ //Key down }J|Pd3Q Sf  
   switch(wParam) I&|J +B?#  
   { y:ad%,. C  
    case VK_MENU: ~SR9*<  
     MaskBits|=ALTBIT; >m4Q*a4M  
     break; /m(v5v7(  
    case VK_CONTROL: 5.zv0tJku  
     MaskBits|=CTRLBIT; %<[U\TL`  
     break; b*W01ist  
    case VK_SHIFT: 8$V:+u  
     MaskBits|=SHIFTBIT; MtKM#@  
     break; 'MY0v_  
    default: //judge the key and send message vZ/Bzy@|  
     break; a?ux  
   } TjLW<D(i>  
   for(int index=0;index<MAX_KEY;index++) Vs@H>97,G  
   { J0O wzO  
    if(hCallWnd[index]==NULL) xty)*$C>  
     continue; w4(g]9^Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I/ V`@*/+  
    { ;FO( mL(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N Obw/9JO  
     bProcessed=TRUE; *^Xtorqo  
    } xmBGZ4f%  
   } B4 +A  
  } U)iq  
  if(!bProcessed){ s\3OqJo%)  
   for(int index=0;index<MAX_KEY;index++){ fsz:A"0H  
    if(hCallWnd[index]==NULL) jltW@co2sV  
     continue; Y;[+^J*a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vvmG46IgZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6Us*zKgW  
   } U3b&/z|b?  
  } dxK3462  
 } P1IL ]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :DoE_  
} w-wap  
o%sx(g=q6  
BOOL InitHotkey() 'jj|bN  
{ II) K0<  
 if(hHook!=NULL){ %+0V0.  
  nHookCount++; nX|]JW  
  return TRUE; 9A!B|s  
 } =dDr:Y<@*  
 else r0(*]K:.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]o3K  
  if(hHook!=NULL) EaUO>S  
   nHookCount++; #d;/Me  
  return (hHook!=NULL); 8c^Hfjr0  
} ^< wn  
BOOL UnInit() $BUm,  
{ s{ dgUX  
 if(nHookCount>1){ K0C3s  
  nHookCount--; UNJAfr P  
  return TRUE; 1Zt>andBF  
 } \^]*T'>b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?`T-A\A=  
 if(unhooked==TRUE){ ^SC2k LI  
  nHookCount=0; J`xCd/G  
  hHook=NULL; 35/K9l5  
 } `|WEzW~  
 return unhooked; p`/c&}  
} }C!g x6  
+\)a p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cT(=pMt8>  
{ W\5PsGUsv  
 BOOL bAdded=FALSE; l _gJC.  
 for(int index=0;index<MAX_KEY;index++){ (L'|n *Cr  
  if(hCallWnd[index]==0){ Qs\*r@6?  
   hCallWnd[index]=hWnd; 8"yZS)09  
   HotKey[index]=cKey; Wf:LYL  
   HotKeyMask[index]=cMask; pX?/=T@ Bw  
   bAdded=TRUE; k<}3_   
   KeyCount++; r<c&;*  
   break;  KGJ *h  
  } _:7:ixN[Ie  
 } kY^ k*-v  
 return bAdded;  *"Uf|  
} L6Io u  
$(+#$F<eo+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V[2}  
{ 4=qZ Z>[t  
 BOOL bRemoved=FALSE; Ld?'X=eQ  
 for(int index=0;index<MAX_KEY;index++){ yZQcxg%  
  if(hCallWnd[index]==hWnd){ M2pFXU?]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Nk;ywC"e;  
    hCallWnd[index]=NULL; C2C 1 @=w  
    HotKey[index]=0; 9 :,ZG4s  
    HotKeyMask[index]=0; 3*=_vl3  
    bRemoved=TRUE; /I &wh  
    KeyCount--; W^YaC (I  
    break; 8F9x2CM-[C  
   } ve^gzE$<I  
  } yS1i$[JV  
 } YF)k0bu&;  
 return bRemoved; SFR<T  
} ;cfPS  
<S3s==Cg  
void VerifyWindow() &a.A8v)  
{ Z -fiJ75  
 for(int i=0;i<MAX_KEY;i++){ JA~q}C7A7o  
  if(hCallWnd!=NULL){ lc\{47LwZ  
   if(!IsWindow(hCallWnd)){ qP BOt;N  
    hCallWnd=NULL; i2+_~$f  
    HotKey=0; -G(#,rXk  
    HotKeyMask=0; n?*r,)'  
    KeyCount--; d9up! k  
   } QJ+Ml  
  } 1pAcaJzf  
 } H3L uRGe&2  
} b|e1HCH  
gY!?JZC-0  
BOOL CHookApp::InitInstance() {5]c \_.  
{ <$??Z;6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7n,=`0{r  
 hins=AfxGetInstanceHandle(); Y_)xytJ$  
 InitHotkey(); +U)4V}S)  
 return CWinApp::InitInstance(); M+*K-zt0  
} W*B=j[w  
HD'adj_,  
int CHookApp::ExitInstance() cx]H8]ch7  
{ ow{J;vFy\  
 VerifyWindow(); c9x&:U  
 UnInit(); r @}N6U~*  
 return CWinApp::ExitInstance(); !e:_$$j  
} Qk >9o  
zx5#eMD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |DYgc$2pN  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G=]ox*BY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V*DDU]0k  
#if _MSC_VER > 1000 ?dPr HSy  
#pragma once .N7<bt@~)  
#endif // _MSC_VER > 1000 [&g"Z"  
,0c]/Sd*p  
class CCaptureDlg : public CDialog @C%6Wo4l3  
{ ST2:&xH(  
 // Construction OG9 '[o`8  
 public: !yd ]~t 5Q  
  BOOL bTray; (D:-p:q.  
  BOOL bRegistered; 6j!idA!'  
  BOOL RegisterHotkey(); udXzsY9Ng  
  UCHAR cKey; D?=4'"@v  
  UCHAR cMask; \SoT^PW  
  void DeleteIcon(); e+V8I&%  
  void AddIcon(); J/IRCjQ}  
  UINT nCount; 8L+A&^qx  
  void SaveBmp(); y^z c @f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 1nw\?r2  
  // Dialog Data -y>~ :.  
  //{{AFX_DATA(CCaptureDlg) sY4q$Fq  
  enum { IDD = IDD_CAPTURE_DIALOG }; CF 3V)3}  
  CComboBox m_Key; zU0SlRFu  
  BOOL m_bControl; H32o7]lT  
  BOOL m_bAlt; #^BttI  
  BOOL m_bShift; icb *L~qm  
  CString m_Path; XOLE=zdSp  
  CString m_Number; KY}H-  
  //}}AFX_DATA ltlo$`PR  
  // ClassWizard generated virtual function overrides hw.>HT|.N  
  //{{AFX_VIRTUAL(CCaptureDlg) bYoBJ #UX  
 public: 8 /%{xB^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); w51l;2$des  
 protected: y+Hz(}4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D(OJr5Gg  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1$+8wDVwad  
  //}}AFX_VIRTUAL @+l=R|  
  // Implementation J ?EDz,  
 protected: q#@r*hl  
  HICON m_hIcon; >cLh$;l  
  // Generated message map functions N:+)6a  
  //{{AFX_MSG(CCaptureDlg) 0ckmHv  
  virtual BOOL OnInitDialog(); w $Fg 0JS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); { 0-on"o  
  afx_msg void OnPaint(); DVVyWn[  
  afx_msg HCURSOR OnQueryDragIcon(); [uK{``"  
  virtual void OnCancel(); N .H<'Q8&  
  afx_msg void OnAbout(); jJ-C\ v  
  afx_msg void OnBrowse(); -cijLlz%+  
  afx_msg void OnChange(); jCXBp>9$M  
 //}}AFX_MSG a+cDH  
 DECLARE_MESSAGE_MAP() %<x! mE x  
}; 46pR!k  
#endif 7~F~'V  
xQ7U$QF|]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "l9aBBiu  
#include "stdafx.h" :o .+<_ &  
#include "Capture.h" =JW-EQ6[T  
#include "CaptureDlg.h" !><asaB]1  
#include <windowsx.h> +'-.c"  
#pragma comment(lib,"hook.lib") vg5_@7  
#ifdef _DEBUG /s~S\dG  
#define new DEBUG_NEW EEnl'  
#undef THIS_FILE /aMOZ=,q}  
static char THIS_FILE[] = __FILE__; aWlIq(dU  
#endif hxK;f  
#define IDM_SHELL WM_USER+1 \xbUr`WBY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !yxqOT-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~bC A8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C l,vBjl h  
class CAboutDlg : public CDialog R"9w VM;*c  
{ XL^05  
 public: vXRY/Zzj1  
  CAboutDlg(); KyfH8Na?  
  // Dialog Data 6o7t eX  
  //{{AFX_DATA(CAboutDlg) e).;;0  
  enum { IDD = IDD_ABOUTBOX }; [!yA#{xl,  
  //}}AFX_DATA &e@)yVLL  
  // ClassWizard generated virtual function overrides 2jC`'8  
  //{{AFX_VIRTUAL(CAboutDlg) :>2wVN&\c  
 protected: !& >`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  u\L}B!  
  //}}AFX_VIRTUAL ^a_a%ws  
  // Implementation 4k-Ak6s  
 protected: $\Y&2&1s  
  //{{AFX_MSG(CAboutDlg) pITF%J@_]  
  //}}AFX_MSG xE w\'tH  
  DECLARE_MESSAGE_MAP() Pv/ v=s>X  
};  L"%SU  
w $6Z}M1d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [)1vKaC  
{ kI)}7e  
 //{{AFX_DATA_INIT(CAboutDlg) vM6W64S  
 //}}AFX_DATA_INIT gWGDm~+  
} $q)YC.5$  
4minzrKM\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5N;'CAk  
{ Mh4MaLw  
 CDialog::DoDataExchange(pDX); D,ZLo~  
 //{{AFX_DATA_MAP(CAboutDlg) |DJ8 "T]E  
 //}}AFX_DATA_MAP +Gt9!x}#e  
} *H/3xPh,*  
ft6)n T/"&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) LCH\;07V#  
 //{{AFX_MSG_MAP(CAboutDlg) %g}d}5s  
 // No message handlers X<}}DZSu a  
 //}}AFX_MSG_MAP 7>__ fQu  
END_MESSAGE_MAP() ^0}ma*gi~  
/oHCV0!0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |cf-S8pwY  
: CDialog(CCaptureDlg::IDD, pParent) PY.K_(D  
{ >ep<W<b  
 //{{AFX_DATA_INIT(CCaptureDlg) p> `rTaeZg  
  m_bControl = FALSE; )*;Tt @'y  
  m_bAlt = FALSE; /;#kV]nF  
  m_bShift = FALSE; oCa Ymi=:  
  m_Path = _T("c:\\"); );7 d_#  
  m_Number = _T("0 picture captured."); QDg5B6>$  
  nCount=0; |(3 y09  
  bRegistered=FALSE; q>.7VN[ vE  
  bTray=FALSE; nc k/Dw  
 //}}AFX_DATA_INIT y9 {7+]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h#hr'3bI1  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); FBNLszT{L  
} *#mmk1`  
S} m=|3%y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m4hkV>$d  
{ })/P[^  
 CDialog::DoDataExchange(pDX); z4:!*:.Asu  
 //{{AFX_DATA_MAP(CCaptureDlg) )t|:_Z  
  DDX_Control(pDX, IDC_KEY, m_Key); G&g;ROgY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a|7C6#iz$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |q*yuK/  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); BV~J*e  
  DDX_Text(pDX, IDC_PATH, m_Path); 3U@jw,K!{A  
  DDX_Text(pDX, IDC_NUMBER, m_Number); i< ^X z  
 //}}AFX_DATA_MAP M%S7cIX ]F  
} F] c\Qt  
%Rc#/y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *#Cx-J  
//{{AFX_MSG_MAP(CCaptureDlg) =GX5T(P8k  
 ON_WM_SYSCOMMAND() k<<x}=  
 ON_WM_PAINT() bej(Ds0  
 ON_WM_QUERYDRAGICON() 3x+lf4"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) E)_n?>Ar  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %;'~TtW5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) w \b+OW  
//}}AFX_MSG_MAP X,k^p[Rcu  
END_MESSAGE_MAP() Pao^>rj  
7S a9  
BOOL CCaptureDlg::OnInitDialog() s:3[#&PQpN  
{ +F8{4^w1  
 CDialog::OnInitDialog(); RpivO,   
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); l )%PvLbL  
 ASSERT(IDM_ABOUTBOX < 0xF000); }(nT(9|  
 CMenu* pSysMenu = GetSystemMenu(FALSE); SOOVUMj  
 if (pSysMenu != NULL) {<,%_pJR  
 { [:y:_ECs6  
  CString strAboutMenu; [CJ<$R !  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8fXiadP#  
  if (!strAboutMenu.IsEmpty()) :0J`4  
  { PK[mf\G\  
   pSysMenu->AppendMenu(MF_SEPARATOR); ~[ufL25K  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *dw.=a9  
  } a^ %iAe  
 } W+ S~__K  
 SetIcon(m_hIcon, TRUE); // Set big icon <fUo@]Lv  
 SetIcon(m_hIcon, FALSE); // Set small icon S^rf^%  
 m_Key.SetCurSel(0); !D??Y^6bI  
 RegisterHotkey(); [YOH'i&X  
 CMenu* pMenu=GetSystemMenu(FALSE); xb;{<~`71  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wMW<lT=;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); A=N$5ZJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oYqH l1cs  
 return TRUE; // return TRUE unless you set the focus to a control {kpF etXt?  
} b@Oq}^a&o  
s)1-xA{'.  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) m!<HZvq?vf  
{ 6("_}9ZOc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )2[)11J9t  
 { n28JWkK8  
  CAboutDlg dlgAbout; V 0Bl6  
  dlgAbout.DoModal(); |+nmOi,z  
 } e5' I W__  
 else ,PlH|  
 { 8 lggGt  
  CDialog::OnSysCommand(nID, lParam); b80#75Bj>  
 }  2v{WX  
} nR_Z rm  
=CLPz8  
void CCaptureDlg::OnPaint() #V>R#Oh}  
{ LF7- ?? '  
 if (IsIconic()) pD<w@2K  
 { *vb"mB  
  CPaintDC dc(this); // device context for painting @]Cg5QW>T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8 .%0JJ.3  
  // Center icon in client rectangle 5$9$R(KU  
  int cxIcon = GetSystemMetrics(SM_CXICON); Q %o@s3~O  
  int cyIcon = GetSystemMetrics(SM_CYICON);  +mocSx[  
  CRect rect; zgb$@JC  
  GetClientRect(&rect); -UhpPw 6  
  int x = (rect.Width() - cxIcon + 1) / 2; FGV L[\  
  int y = (rect.Height() - cyIcon + 1) / 2; :j&enP5R(q  
  // Draw the icon .6wPpLG?{  
  dc.DrawIcon(x, y, m_hIcon); D3o,2E(o  
 } !ho^:}m  
 else )?rq8VO  
 { (:l6R9'=  
  CDialog::OnPaint(); R"t#dG]1t  
 } b| L;*<KU  
} "^]gIQc  
YmV/[{  
HCURSOR CCaptureDlg::OnQueryDragIcon() J^7m?mA  
{ F[ E'R.:  
 return (HCURSOR) m_hIcon; JxVGzb`8  
} zhn ?;Fi  
&da=hc,>%  
void CCaptureDlg::OnCancel() u BEw YQB  
{ ^'X I%fEf  
 if(bTray) #NM)  
  DeleteIcon(); {Ze Y:\G~  
  CDialog::OnCancel(); X$kLBG_  
} Y|tHU'x  
j,YrM?Xdo  
void CCaptureDlg::OnAbout() F.vRs|fk  
{ #T)Gkc"{  
 CAboutDlg dlg; yT^2;/Z  
 dlg.DoModal(); ^>|ZN2  
} /M2in]oH  
h#0n2o#  
void CCaptureDlg::OnBrowse() >G`p T#  
{ ?mH=3 :~  
 CString str; zhJeTctRz  
 BROWSEINFO bi; :2/L1A)O  
 char name[MAX_PATH]; FvsVfV U  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); TEV DES  
 bi.hwndOwner=GetSafeHwnd(); vj?{={Y  
 bi.pszDisplayName=name; y [Vd*8  
 bi.lpszTitle="Select folder"; ?N{\qF1Mz  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 971=OEyq*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?b_E\8'q]  
 if(idl==NULL) ,hzRqFg2  
  return; N'b GL%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 24wDnDyh  
 str.ReleaseBuffer(); {6u)EJ  
 m_Path=str; W?Z>g"  
 if(str.GetAt(str.GetLength()-1)!='\\') l!p`g>$&f  
  m_Path+="\\"; e'mF1al  
 UpdateData(FALSE); uEgR>X>  
} . X!!dx1<  
_9BL7W $;  
void CCaptureDlg::SaveBmp() 9B~&d(Bm  
{ #Y= A#Yz,{  
 CDC dc; A"*=K;u/|m  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8u*<GbKGI  
 CBitmap bm; GgxPpS<ne  
 int Width=GetSystemMetrics(SM_CXSCREEN); YKe&Ph.  
 int Height=GetSystemMetrics(SM_CYSCREEN); bd /A0i?C  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )WvKRp r  
 CDC tdc; SkDr4kds  
 tdc.CreateCompatibleDC(&dc); SGKAx<U  
 CBitmap*pOld=tdc.SelectObject(&bm); M7BpOmK'  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ..yV=idI  
 tdc.SelectObject(pOld); :'DX M{  
 BITMAP btm; EC,,l'%a|/  
 bm.GetBitmap(&btm); Y%i<~"k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4 QQt 0u0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4j3q69TZR  
 BITMAPINFOHEADER bih; ]I*RuDv}  
 bih.biBitCount=btm.bmBitsPixel; 2*snMA  
 bih.biClrImportant=0; @Z/jaAjUC  
 bih.biClrUsed=0; fDr$Wcd~  
 bih.biCompression=0; [>NMuwtG  
 bih.biHeight=btm.bmHeight; :}_hz )  
 bih.biPlanes=1; knO X5UnS  
 bih.biSize=sizeof(BITMAPINFOHEADER); M[I=N  
 bih.biSizeImage=size; 7"| Qmyb  
 bih.biWidth=btm.bmWidth; !$n@:W/  
 bih.biXPelsPerMeter=0; #GGa,@O  
 bih.biYPelsPerMeter=0; !W XV1S  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?Nt(sZ-  
 static int filecount=0; huqtk4u  
 CString name; M XW1 :  
 name.Format("pict%04d.bmp",filecount++); 7bYwh8  
 name=m_Path+name; 4lPO*:/  
 BITMAPFILEHEADER bfh; (pH)QG  
 bfh.bfReserved1=bfh.bfReserved2=0; 7s^b@&Le  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ep-bx&w+  
 bfh.bfSize=54+size; XrUI [ryE  
 bfh.bfOffBits=54; YXo?(T..  
 CFile bf; r!b>!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <5L99<E  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); F7' MoH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?"'+tZ=f6  
  bf.WriteHuge(lpData,size); [+FiD  
  bf.Close(); #i~P])%gNP  
  nCount++; W7C1\'T  
 } E3a^"V3p  
 GlobalFreePtr(lpData); vcW(?4e  
 if(nCount==1) {_tq6ja-<  
  m_Number.Format("%d picture captured.",nCount); wYe;xk`>  
 else !{,2uQXe  
  m_Number.Format("%d pictures captured.",nCount); Qz=e'H  
  UpdateData(FALSE); NEIF1( :  
} <LZ#A@]71  
T0A=vh;S  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) CH `Kpt  
{ `i|!wD,=\  
 if(pMsg -> message == WM_KEYDOWN) H3!9H  
 { K 91O$'J  
  if(pMsg -> wParam == VK_ESCAPE) Y*b$^C%2  
   return TRUE; X\BFvSv8C  
  if(pMsg -> wParam == VK_RETURN) &W3srJo  
   return TRUE; u~,hT Y(%  
 } 0B[~j7EGO  
 return CDialog::PreTranslateMessage(pMsg); V.8Vy1$  
} gs+n J+b  
H|e7IsY%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {|$kI`h,3-  
{ cRs\()W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3 }sy{Mx%9  
  SaveBmp(); fP 3eR>e  
  return FALSE; ]Ky`AG`2~  
}  N MkOx$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Eve,*ATI  
 CMenu pop; yOD=Vc7i  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); zA?AX1%Wa  
 CMenu*pMenu=pop.GetSubMenu(0); 3u t<o-  
 pMenu->SetDefaultItem(ID_EXITICON); ^f N/  
 CPoint pt; ?*UWg[  
 GetCursorPos(&pt);  R`o Xkj  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \0Xq&CG=E  
 if(id==ID_EXITICON) #'@@P6o5  
  DeleteIcon(); -p0*R<t  
 else if(id==ID_EXIT) ]w,|WZm  
  OnCancel(); vH}VieU  
 return FALSE; 5GPrZY"  
} 6Ik v}q_j  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); hVyeHbx  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ``]NB=N}{1  
 AddIcon(); ltrti.&  
 return res; w_"-rGV  
} uzb|yV'B  
[xb'73  
void CCaptureDlg::AddIcon() G,+3(C  
{ 1fV)tvU$  
 NOTIFYICONDATA data; g`Q!5WK*  
 data.cbSize=sizeof(NOTIFYICONDATA); $mf O:%  
 CString tip; d%L/[.&  
 tip.LoadString(IDS_ICONTIP); @K S.H  
 data.hIcon=GetIcon(0); InRRcn(  
 data.hWnd=GetSafeHwnd(); @+ T33X)h%  
 strcpy(data.szTip,tip); Ll%}nti  
 data.uCallbackMessage=IDM_SHELL; k|RY; 8_  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; JoG(Nk]  
 data.uID=98; ,jW a&7  
 Shell_NotifyIcon(NIM_ADD,&data); F_ -Xx"  
 ShowWindow(SW_HIDE); YuHXm3[  
 bTray=TRUE; [_ uT+q3  
} v=dK2FaY  
gw">xt5  
void CCaptureDlg::DeleteIcon() M17+F?27M  
{ /V2yLHm  
 NOTIFYICONDATA data; s^.tj41Gx}  
 data.cbSize=sizeof(NOTIFYICONDATA); o*E32#l  
 data.hWnd=GetSafeHwnd(); > Xij+tt{  
 data.uID=98; Hj1?c,mo4  
 Shell_NotifyIcon(NIM_DELETE,&data); A|4 3W =  
 ShowWindow(SW_SHOW); aMT=pGU  
 SetForegroundWindow(); C]3:&dx9  
 ShowWindow(SW_SHOWNORMAL); \|B\7a'4  
 bTray=FALSE; U|QP] 6v  
} q-@&n6PEOZ  
p Djt\R<f  
void CCaptureDlg::OnChange() y\CxdTs  
{ -s)h ?D  
 RegisterHotkey(); wSM(!:on5  
} ?I+$KjE+  
6Hy_7\$(-  
BOOL CCaptureDlg::RegisterHotkey() u|\?6fz  
{ +Y;hVc E9  
 UpdateData(); uvR l`"Y  
 UCHAR mask=0; *c%{b3T_  
 UCHAR key=0; >[nR$8_J-l  
 if(m_bControl) '6g-]rE[  
  mask|=4; M$!-B,1BX  
 if(m_bAlt) {KK/mAp{  
  mask|=2; {: \LFB_  
 if(m_bShift) Chad}zU`  
  mask|=1; C7AD1rl  
  key=Key_Table[m_Key.GetCurSel()]; {61Y;  
 if(bRegistered){  8 }AWU  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =HV${+K=~  
  bRegistered=FALSE; 0`v-pL0|  
 } #Jp|Cb<qx  
 cMask=mask; n{{"+;oR  
 cKey=key; r XBC M  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "j_cI-@6  
 return bRegistered; ZzQLbCV  
} ZCBF&.!  
KLu Og$i  
  四、小结 z6,E} Y  
H?ug-7k/  
  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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