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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: (rG1_lUDu  
  D+)=bPMe  
  一、实现方法 0;h1LI)  
3uw7 J5x  
  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: /h M>dkwu  
`I>K?  
#pragma data_seg("shareddata") ; BZM~ '  
HHOOK hHook =NULL; //钩子句柄 ;a3nH  
UINT nHookCount =0; //挂接的程序数目 ,4Fqvg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 pG( knu  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 y9L#@   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %7evPiNB  
static int KeyCount =0; ?Bzi#Z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tv OAN|+F  
#pragma data_seg() G; [A Q:Iy  
1 (i>Vt.+  
  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。 6{$dFwl  
bQy%$7UmX,  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: P082.:q"  
`zp2;]W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR MH.,s@  
cKey,UCHAR cMask) bX H^Bm  
{ icul15'i  
 BOOL bAdded=FALSE; @,4%8E5  
 for(int index=0;index<MAX_KEY;index++){ Uo}&-$B  
  if(hCallWnd[index]==0){ i+[3o@  
   hCallWnd[index]=hWnd; '= <`@  
   HotKey[index]=cKey; <gdgcvd  
   HotKeyMask[index]=cMask; b H?qijrC  
   bAdded=TRUE; V0Z7o\-J  
   KeyCount++; Hm VTfH'  
   break; )6Q0f  
  } b'1d<sD  
 } PS(j)I3  
 return bAdded; -?nT mzRc  
} m_$I?F0  
//删除热键 +q j*P9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EOX_[ek7  
{ 06^1#M$'  
 BOOL bRemoved=FALSE; ZGpTw[5ql  
 for(int index=0;index<MAX_KEY;index++){ @pG lWw9*  
  if(hCallWnd[index]==hWnd){ 3Y{)(%I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ pRwGv  
    hCallWnd[index]=NULL; UB$`;'|i  
    HotKey[index]=0; U[QD!  
    HotKeyMask[index]=0;  aoDD&JE  
    bRemoved=TRUE; {* j^g6;  
    KeyCount--; "Wk{4gS7l  
    break; r^A#[-VyNP  
   } `SjD/vNE  
  } [b.'3a++  
 } BO4 K#H7  
 return bRemoved; 9J7J/]7f  
} "b>KUzuYT  
! F <] T  
=*g$#l4  
  DLL中的钩子函数如下:  l}0V+  
[9O~$! <%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E,LYS"%_  
{ }utNZhJ  
 BOOL bProcessed=FALSE; V`\f+Uu  
 if(HC_ACTION==nCode) `cP'~OT  
 { E ;!<Z4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *?bk?*?s  
   switch(wParam) =kb6xmB^t  
   {  %R|"Afa=  
    case VK_MENU: e[QxFg0E  
     MaskBits&=~ALTBIT; vV.~76AD5  
     break; 6%kJDY.  
    case VK_CONTROL: bqrJP3  
     MaskBits&=~CTRLBIT; qggk:cN1  
     break; (~Uel1~@  
    case VK_SHIFT: }@14E-N=  
     MaskBits&=~SHIFTBIT; (.,'}+1  
     break; P-+M,>vNy[  
    default: //judge the key and send message {zz6XlKPj  
     break; lU $4NU wM  
   } z,bX.*.-  
   for(int index=0;index<MAX_KEY;index++){ g. ?*F#2  
    if(hCallWnd[index]==NULL) TH>?Gi) "  
     continue; +`*qlP;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7w Q+giu  
    { `pi-zE)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t0bhXFaiE  
     bProcessed=TRUE; abo>_"9-  
    } sm;E2BR$ `  
   } QtY hg$K3  
  } `~ _H=l9{  
  else if((lParam&0xc000ffff)==1){ //有键按下 S,9NUt  
   switch(wParam) E69:bQ94u  
   { PZuq'^p  
    case VK_MENU: (/U)> %n  
     MaskBits|=ALTBIT; U|J$?aFDr  
     break; 5fu+rU-#  
    case VK_CONTROL: GsIwY {d  
     MaskBits|=CTRLBIT; #0bO)m+NZ  
     break; Q1`<fD  
    case VK_SHIFT: ({%oi h  
     MaskBits|=SHIFTBIT; /5Zp-Pq  
     break; #2Pr Gz]  
    default: //judge the key and send message Jcz]J)|5v  
     break; =.36y9Mfo  
   } 7uPZuXHxcu  
   for(int index=0;index<MAX_KEY;index++){ P +dA~2k  
    if(hCallWnd[index]==NULL) 5: daa  
     continue; sI&i{D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v2hZq-q  
    { 6<x~Mk'u)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gA~20LSt  
     bProcessed=TRUE; zoZ<)x=;  
    } C.J`8@a]?  
   } ~;M)qR?]W  
  } E X%6''ys  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 *jk3 \KaoV  
   for(int index=0;index<MAX_KEY;index++){ 3 p/b  
    if(hCallWnd[index]==NULL) Ih.rC>)rx  
     continue; Deg!<[Nw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5D,.^a1 A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (I-<f$3  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?y ~TCqV  
   } q#P$'7"  
  } 10wvfRhng  
 } v*E(/}<v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r&}(9Cq&"y  
} U1ZIuDg'E  
KH7VR^;mk  
  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: j-7u>s-l  
iI5+P`sE&J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f UC9-?(K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KZ=u54  
&V'519vmoZ  
  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: CuH2E>wz  
7vn%kW=$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~C&*.ZR  
{ &&=[Ivv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hAm/mu  
 { GCDwWCxh  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p SHSgd ~&  
  SaveBmp(); #j;Tb2&w  
  return FALSE; _7U]&Nh99  
 } X1+ wX`f  
 …… //其它处理及默认处理 'Qa5n\HX$  
} eD%H XGe  
w OI^Q~  
-fE.<)m=!  
  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。 /~De2mq1   
UuU/c-.  
  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。 *?/tO, R?  
BZK2$0  
  二、编程步骤 C5xag#Z1  
zuSq+px L@  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; :0$a.8Y\++  
tz26=8  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |EKu2We*  
E<tK4?i"  
  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; 0RUi\X4HI  
!b8uLjd;  
  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; YEv%C| l  
~#R9i^Y  
  5、 添加代码,编译运行程序。 'JieIKu  
Ko6^iI1  
三、程序代码 EIjI!0j  
: [q0S@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 'OwyyPBF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) MtS3p>4  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ v2Bzx/F:  
#if _MSC_VER > 1000 dBSbu=^$)  
#pragma once (hIF]>,kl  
#endif // _MSC_VER > 1000 jjRUL.  
#ifndef __AFXWIN_H__ + WVIZZ8  
#error include 'stdafx.h' before including this file for PCH ~vHk&r]|  
#endif "13 "`!m  
#include "resource.h" // main symbols xg<Hxn,<M  
class CHookApp : public CWinApp 41G5!=i  
{ 5G(3vRX|1  
 public: +k.%PO0np  
  CHookApp(); y}FZD?"  
  // Overrides )KE [!ofD  
  // ClassWizard generated virtual function overrides |?d#eQ9a  
  //{{AFX_VIRTUAL(CHookApp) j%L&jH 6@  
 public: fmfTSN(Q~`  
  virtual BOOL InitInstance(); K=dR%c(  
  virtual int ExitInstance(); `0ZZ/] !L  
  //}}AFX_VIRTUAL Qck| #tc  
  //{{AFX_MSG(CHookApp) u7fK1 ^O  
  // NOTE - the ClassWizard will add and remove member functions here. :IMdN}(L  
  // DO NOT EDIT what you see in these blocks of generated code ! 1|{bDlmt  
  //}}AFX_MSG OoBCY-gj*  
  DECLARE_MESSAGE_MAP() nOb?-rR  
}; ZE?f!ifp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); qH> `}/,P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %dMqpY7"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eujK4s  
BOOL InitHotkey(); =^&%9X  
BOOL UnInit(); &;E5[jO^D  
#endif >5hhd38  
(@r `$5D.b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. F(5hmr  
#include "stdafx.h" /P:.qtT(  
#include "hook.h" -`b8T0?oK  
#include <windowsx.h> `Out(Hn  
#ifdef _DEBUG IvHh4DU3Z  
#define new DEBUG_NEW ,1oQ cC  
#undef THIS_FILE slu(SmQ  
static char THIS_FILE[] = __FILE__; U!(@q!>G  
#endif \3Pv# )  
#define MAX_KEY 100 ~j>D=!  
#define CTRLBIT 0x04 |&3x#1A  
#define ALTBIT 0x02 P`$!@T0=  
#define SHIFTBIT 0x01 DC+b=IOz  
#pragma data_seg("shareddata") t23'x0l  
HHOOK hHook =NULL; : i~W } r  
UINT nHookCount =0; eS+g|$cW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey M;w?[yEZ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT :~F:/5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 59r_#(uo  
static int KeyCount =0; aAE>)#f(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :#5xA?=* S  
#pragma data_seg() 6E ~g#(8  
HINSTANCE hins; 2S"Nf8>zp  
void VerifyWindow(); 69m ;XdkKz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s 5WqR 8  
//{{AFX_MSG_MAP(CHookApp) \Q~8?p+  
// NOTE - the ClassWizard will add and remove mapping macros here. H 3@Z.D  
// DO NOT EDIT what you see in these blocks of generated code! lg :  
//}}AFX_MSG_MAP {ZU1x C  
END_MESSAGE_MAP() .zg8i_  
\OILWQ[/  
CHookApp::CHookApp() 5U`ZbG  
{ oF]cTAqhC.  
 // TODO: add construction code here, [AU II*:}  
 // Place all significant initialization in InitInstance j.e0;! (L}  
} uo\ .7[1  
F&RgT1*  
CHookApp theApp; L< ^j"!0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) = ?D(g  
{ q  h/F  
 BOOL bProcessed=FALSE; }`(N:p  
 if(HC_ACTION==nCode) fq )vK  
 { ;-P)m  
  if((lParam&0xc0000000)==0xc0000000){// Key up A4C+5R  
   switch(wParam) t.T UmJ  
   { #LlUxHv #  
    case VK_MENU: 3_Cp%~Gi-_  
     MaskBits&=~ALTBIT; VKp*9%9  
     break; vhbDb)J  
    case VK_CONTROL: O.aG[ wm8  
     MaskBits&=~CTRLBIT; cH' iA.  
     break; Q?b14]6im  
    case VK_SHIFT: Fm\"{)V:b  
     MaskBits&=~SHIFTBIT; 2. G=8:l  
     break; b-ll  
    default: //judge the key and send message fmqb` %  
     break; KWAb-yB  
   } 7ELMd{CD  
   for(int index=0;index<MAX_KEY;index++){ C%d_@*82  
    if(hCallWnd[index]==NULL) `Z: R Ce^  
     continue; N6K* d` o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hu_ ^OlF  
    { }%b;vzkG5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7SDFz}  
     bProcessed=TRUE; &|>S|  
    } 1"Z@Q`}  
   } 'c2W}$q  
  } XU!2YO)t;!  
  else if((lParam&0xc000ffff)==1){ //Key down =4V&*go*\  
   switch(wParam) *B`Zq)  
   { gE#>RM5D  
    case VK_MENU: 4[Z\ ?[  
     MaskBits|=ALTBIT; glDcUCF3  
     break; Jk@]tAwoM  
    case VK_CONTROL: 7C#`6:tI  
     MaskBits|=CTRLBIT; --;@2:lg{  
     break; &'cL%.  
    case VK_SHIFT: vEf4HZ&w  
     MaskBits|=SHIFTBIT; \(226^|j  
     break; 8fA_p}wp  
    default: //judge the key and send message mxor1P#|  
     break; x{D yTtX<  
   } ? WJ> p  
   for(int index=0;index<MAX_KEY;index++) ^` un'5Vk  
   { S$KFf=0  
    if(hCallWnd[index]==NULL) >U F  
     continue; f#+el y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3bO(?l`3h  
    { BA\/YW @  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HhO".GA  
     bProcessed=TRUE; oFOnjK"|F  
    } %ZHP2j %~  
   } oFjIA!  
  } ;&H4u)  
  if(!bProcessed){ z/i+EE  
   for(int index=0;index<MAX_KEY;index++){ 21k5I #U  
    if(hCallWnd[index]==NULL) r0p w_j  
     continue; YK|bXSA[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *JggU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8DP+W$  
   } %$%& m1Y  
  } x.Q&$#  
 } vJAZ%aW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !9 fz(9  
} Gt9&)/#  
IV\J3N^  
BOOL InitHotkey() 2WUT/{:X  
{ Uj&W<'I  
 if(hHook!=NULL){ xsWur(>]  
  nHookCount++; j ";2o(  
  return TRUE; (sVi\R  
 } nUkaz*4qU  
 else f~ }H  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !i=nSqW  
  if(hHook!=NULL) 9UvXC)R1  
   nHookCount++; eQQ>  
  return (hHook!=NULL); ^CwR!I.D}4  
} wAnb Di{W  
BOOL UnInit() !w&kyW?e  
{ 2^?:&1:  
 if(nHookCount>1){ v4@Z(M  
  nHookCount--; n3J53| %v  
  return TRUE; cwGbSW$t  
 } NcY608C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); }9nDo*A"}  
 if(unhooked==TRUE){ AT5aDEb^^  
  nHookCount=0; c-.t>r &  
  hHook=NULL; Jx'i2&hGN  
 } M'_9A  
 return unhooked; wEzKqD  
} `xrmT t X  
5dZ|!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3sd"nR?aX  
{ odIZo|dv  
 BOOL bAdded=FALSE; \U@rg4  
 for(int index=0;index<MAX_KEY;index++){ ?-1r$31p  
  if(hCallWnd[index]==0){ &=4(l|wcg  
   hCallWnd[index]=hWnd; LM2TZ   
   HotKey[index]=cKey; RT%pDym\  
   HotKeyMask[index]=cMask; ;sHN/eF  
   bAdded=TRUE; >>[ G1   
   KeyCount++; vTv]U5%:>%  
   break; )V!dBl"Gq  
  } bXS:x  
 } #r3l[ bKK  
 return bAdded; HF3f)}l$  
} W_0>y9?  
:d ~|jS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (Vo>e =q  
{ 7Pa@1']  
 BOOL bRemoved=FALSE; A&>.74}p  
 for(int index=0;index<MAX_KEY;index++){ Wh&8pH:  
  if(hCallWnd[index]==hWnd){ L/"0ws_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LzYO$Ir:g  
    hCallWnd[index]=NULL; >0l"P"]  
    HotKey[index]=0; TRsE %  
    HotKeyMask[index]=0; ngGO0  
    bRemoved=TRUE; dx ;k`r$w  
    KeyCount--; Y@ZaJ@%9@  
    break; xU%w=0z <  
   } E= `6-H{  
  } dg^L=  
 } je]}R>[r5  
 return bRemoved; iDf,e Kk$'  
} )#LpCM,a  
5Ba[k[b^  
void VerifyWindow() dMrd_1  
{ H{t_xL)k.  
 for(int i=0;i<MAX_KEY;i++){ f-r] |k  
  if(hCallWnd!=NULL){ 7#wn<HDY%  
   if(!IsWindow(hCallWnd)){ 8XsguC  
    hCallWnd=NULL; &d'Awvy0  
    HotKey=0; &N;-J2M  
    HotKeyMask=0; ] Eh}L  
    KeyCount--; Y6&wJ<   
   } +*_5tWAc  
  } `SVmQSwO[  
 } `)QCn<  
} z)uuxNv[R  
uPniLx\t:  
BOOL CHookApp::InitInstance() Y[ N^p#t{  
{ lSH6>0#B  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \%p34K\  
 hins=AfxGetInstanceHandle(); yS=oUE$  
 InitHotkey(); t-LG }nv  
 return CWinApp::InitInstance(); u a\,->  
} "]-Xmdk09  
u<n Lag  
int CHookApp::ExitInstance() ,~?YBLw@c  
{ ++DG5`  
 VerifyWindow(); \cCV6A[  
 UnInit(); =w$}m_AM  
 return CWinApp::ExitInstance(); w}CmfR  
} GLGz 2 ,#  
xzx$TUL  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file hI(SOsKs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) M'!U<Y -  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [b$4Shx  
#if _MSC_VER > 1000 LzCw+@-umw  
#pragma once WQHd[2Z#e  
#endif // _MSC_VER > 1000 <EST?.@~+  
T\r@5Xv  
class CCaptureDlg : public CDialog ~/_SMPLo  
{ pa{re,O"e  
 // Construction KWWa&[ev)  
 public: ox ;  
  BOOL bTray; }@r{?8Ru  
  BOOL bRegistered; Ve 4u +0  
  BOOL RegisterHotkey(); )Jv[xY~  
  UCHAR cKey; kkK kf'  
  UCHAR cMask; {?`al5Sz  
  void DeleteIcon(); -@ZiS^l  
  void AddIcon(); mRZ :ie  
  UINT nCount; ]f1{n  
  void SaveBmp(); V= 1Bo~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hxS 6:5Uc  
  // Dialog Data R-P-i0 ~  
  //{{AFX_DATA(CCaptureDlg) K+6e?5t  
  enum { IDD = IDD_CAPTURE_DIALOG }; qL94SW;  
  CComboBox m_Key; )TmHhNo  
  BOOL m_bControl; Ldn8  
  BOOL m_bAlt; CXCpqcC  
  BOOL m_bShift; Dnc<sd;  
  CString m_Path; xGI, Lk+  
  CString m_Number; ?@n/v F  
  //}}AFX_DATA ,$eK-w  
  // ClassWizard generated virtual function overrides <`0h|m'U  
  //{{AFX_VIRTUAL(CCaptureDlg) i9=&;_z  
 public: $O^v]>h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ./$cMaDJ  
 protected: &  =/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C XHy.&Vt  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *x) 8fAr  
  //}}AFX_VIRTUAL TW^/sx  
  // Implementation Lq>&d,F06)  
 protected: PpsIhMq@  
  HICON m_hIcon; @ps1Dr4s  
  // Generated message map functions 1 tR_8lC  
  //{{AFX_MSG(CCaptureDlg) UswZG^Wh  
  virtual BOOL OnInitDialog(); Zec <m8~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6b!F1  
  afx_msg void OnPaint(); OnWx#84  
  afx_msg HCURSOR OnQueryDragIcon(); 7G)H.L)$m"  
  virtual void OnCancel(); *]i!fzI']  
  afx_msg void OnAbout();  RD tU43  
  afx_msg void OnBrowse(); Q#IG;  
  afx_msg void OnChange(); `~X!Ll  
 //}}AFX_MSG " ZX3sfkh  
 DECLARE_MESSAGE_MAP() #M!!CX*k  
}; `|Or{ih  
#endif jM:Y' l]  
mYU9 trHV  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |] Qg7m,O  
#include "stdafx.h" _uJ"m8Tl  
#include "Capture.h" a[2vjFf#C  
#include "CaptureDlg.h" X<R?uI?L  
#include <windowsx.h> jVH|uX"M5Y  
#pragma comment(lib,"hook.lib") 0KD]j8^  
#ifdef _DEBUG . <tq6 1  
#define new DEBUG_NEW rcGb[=Bf  
#undef THIS_FILE 2[gFkyqe  
static char THIS_FILE[] = __FILE__;  ykrr2x  
#endif ujJI 1I  
#define IDM_SHELL WM_USER+1 4ikdM/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "YB** Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?3O9eZY@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; eznypY=  
class CAboutDlg : public CDialog YSaJeU>@  
{ D/=5tOy  
 public: mR;qMX)0h  
  CAboutDlg(); @zgdq  
  // Dialog Data SwU\ q]^|Z  
  //{{AFX_DATA(CAboutDlg) \(">K  
  enum { IDD = IDD_ABOUTBOX };  {Ha8]y  
  //}}AFX_DATA KzQ3.)/q  
  // ClassWizard generated virtual function overrides 3~#h|?  
  //{{AFX_VIRTUAL(CAboutDlg) =~I-]4  
 protected: IuZ) [*W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TT9z_Q5~  
  //}}AFX_VIRTUAL 2y%,p{="  
  // Implementation mYc.x  
 protected: #Oha(mRY  
  //{{AFX_MSG(CAboutDlg) )z8!f}:De=  
  //}}AFX_MSG %0Y=WYUH>  
  DECLARE_MESSAGE_MAP() cJgBI(S5  
}; ,TRTRb;  
$#|gLVOQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <94_@3  
{ GQ_p-/p R  
 //{{AFX_DATA_INIT(CAboutDlg) \cLSf=  
 //}}AFX_DATA_INIT 6DZ),F,M  
} GHQ;hN:  
kPjd_8z2n  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ``A 0WN  
{ r_YIpnJ  
 CDialog::DoDataExchange(pDX); 7#<c>~   
 //{{AFX_DATA_MAP(CAboutDlg) w{dIFvQ"$  
 //}}AFX_DATA_MAP |7KeR-  
} x3rlJs`$;  
8t=(,^c  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $v8l0JA *  
 //{{AFX_MSG_MAP(CAboutDlg) H\ 1qI7N C  
 // No message handlers  KQ[!o!%  
 //}}AFX_MSG_MAP =H<0o?8?c  
END_MESSAGE_MAP() a=TG[* s  
?`[NFqv_]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) AfC>Q!-w  
: CDialog(CCaptureDlg::IDD, pParent) .qA{xbu  
{ 1&:@  
 //{{AFX_DATA_INIT(CCaptureDlg) P_u|-~|\  
  m_bControl = FALSE; f+.T^es  
  m_bAlt = FALSE;  d^(1TNS  
  m_bShift = FALSE; CB~Q%QLG  
  m_Path = _T("c:\\"); *MI*Rz?4  
  m_Number = _T("0 picture captured."); S^Au#1e   
  nCount=0; H[b}kZW:a  
  bRegistered=FALSE; c)&>$S8*  
  bTray=FALSE; `Bn=?9  
 //}}AFX_DATA_INIT RwVaZJe)l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1oKfy>ie  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $0^P0RAH  
} _owjTo}  
]B=C|usJ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1p'Le!  
{ +u'I0>)S  
 CDialog::DoDataExchange(pDX); MCh#="L2  
 //{{AFX_DATA_MAP(CCaptureDlg) HMY@F_qY`u  
  DDX_Control(pDX, IDC_KEY, m_Key); Ol$WpM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?r_l8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bw&myzs  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =e?$M  
  DDX_Text(pDX, IDC_PATH, m_Path); YwcPX`eg  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~L7:2weV[  
 //}}AFX_DATA_MAP LEECW_:  
} xLZd!>C  
%PJhy2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -=698h*  
//{{AFX_MSG_MAP(CCaptureDlg) h.K(P+h  
 ON_WM_SYSCOMMAND() FEz>[#eOX  
 ON_WM_PAINT() S=3^Q;V/1  
 ON_WM_QUERYDRAGICON() 7~M<cD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !G_jGc=v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2AVc? 9@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @ \2#Dpr  
//}}AFX_MSG_MAP @/%{15s.  
END_MESSAGE_MAP() ~:_0CKa!  
69#8Z+dw7  
BOOL CCaptureDlg::OnInitDialog() G%u9+XV1#  
{ 9j*0D("  
 CDialog::OnInitDialog(); s~26  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); BKU'`5`  
 ASSERT(IDM_ABOUTBOX < 0xF000); #pdUJ2)yM  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Mp\<cE  
 if (pSysMenu != NULL) /NF#+bx  
 { y33~HsOJ  
  CString strAboutMenu; 5(&xNT-n8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #t!}K_  
  if (!strAboutMenu.IsEmpty()) 8cHE[I  
  { Kud'pZ{P  
   pSysMenu->AppendMenu(MF_SEPARATOR); ZkB3[$4C=5  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /,|CrNwY*  
  } (sw-~U%  
 } 8n4V cu  
 SetIcon(m_hIcon, TRUE); // Set big icon cjULX+h  
 SetIcon(m_hIcon, FALSE); // Set small icon EP7AP4  
 m_Key.SetCurSel(0); %IBL0NQT  
 RegisterHotkey(); ELa ja87  
 CMenu* pMenu=GetSystemMenu(FALSE); Gt/4F-Gn  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); # k5#j4!b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }fhHXGK.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0'$p$K  
 return TRUE; // return TRUE unless you set the focus to a control 3}&ZOO   
} #p yim_  
U=Bn>F}y\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >qT'z$  
{ klWYuStZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +yt6(7V*  
 { ;_<)JqUh  
  CAboutDlg dlgAbout; JhR W[~  
  dlgAbout.DoModal(); rVA L|0;3  
 } nv5u%B^  
 else -+U/Lrt>8  
 { G@d`F  
  CDialog::OnSysCommand(nID, lParam); . gZZCf&?  
 } lj&>cScC  
} Zzd/K^gg  
+lO'wa7|3  
void CCaptureDlg::OnPaint() igDyp0t  
{ A~-#@Z  
 if (IsIconic()) B94 &elu  
 { dGgP_ S  
  CPaintDC dc(this); // device context for painting F}ukZ DB  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HW7FP]NH  
  // Center icon in client rectangle :Eh'(   
  int cxIcon = GetSystemMetrics(SM_CXICON); F'J [y"~_  
  int cyIcon = GetSystemMetrics(SM_CYICON); n+2J Dq|?p  
  CRect rect; {w`:KR6o7  
  GetClientRect(&rect); [ug,jEH"S  
  int x = (rect.Width() - cxIcon + 1) / 2; nJ3vi}`  
  int y = (rect.Height() - cyIcon + 1) / 2; OKwOugi0  
  // Draw the icon 0|)19LR  
  dc.DrawIcon(x, y, m_hIcon); nbvkP  
 } V"d=.Hb>  
 else Pl~P-n  
 { Gm=>!.p  
  CDialog::OnPaint(); ^>r^3C)_-  
 } /3^P_\,>f  
} xNdIDj@  
!jh%}JJ  
HCURSOR CCaptureDlg::OnQueryDragIcon() VfSGCe  
{ lQt% Qx  
 return (HCURSOR) m_hIcon; vrrt@y  
} /B HepD}  
Di??Q_$ak  
void CCaptureDlg::OnCancel() f?0s &Xo  
{ k7bl'zic  
 if(bTray) lg/sMF>z\f  
  DeleteIcon(); `B#Z;R  
  CDialog::OnCancel(); -2NwF4VL  
} h$h]%y  
Ge}$rLu]0  
void CCaptureDlg::OnAbout() Sr y,@p)  
{ Q(\ wx  
 CAboutDlg dlg; $@87?Ab  
 dlg.DoModal(); StM/  
} kHU"AD}.  
8&a_A:h  
void CCaptureDlg::OnBrowse() ,hE/II`-d'  
{ M9V-$ _)  
 CString str; -l.pA(O  
 BROWSEINFO bi; .S vyj  
 char name[MAX_PATH];  ?f2G?Y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _5\AS+[x  
 bi.hwndOwner=GetSafeHwnd(); ^L O]Z  
 bi.pszDisplayName=name; 3YTIH2z 5  
 bi.lpszTitle="Select folder"; 5 ;vC(Go  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8gpBz'/,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Tt6{WDscZ  
 if(idl==NULL) r>3^kL5UI  
  return; nu 7lh6o=  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Lpm?# g uR  
 str.ReleaseBuffer(); b:B [3|  
 m_Path=str; T]2U fi.  
 if(str.GetAt(str.GetLength()-1)!='\\') Dt {')  
  m_Path+="\\"; Y. TYc;  
 UpdateData(FALSE); _bQL[eXd  
} tBl#o ^  
/VtlG+dLl  
void CCaptureDlg::SaveBmp() L[]^{ O   
{ a @SUi~+3  
 CDC dc; 2NR7V*A  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =K6c;  
 CBitmap bm; LkaG[^tfN  
 int Width=GetSystemMetrics(SM_CXSCREEN); rUFFF'm\*a  
 int Height=GetSystemMetrics(SM_CYSCREEN); "#XtDpGk  
 bm.CreateCompatibleBitmap(&dc,Width,Height); jT"r$""1d  
 CDC tdc; @DCJ}h ud  
 tdc.CreateCompatibleDC(&dc); g5TkD~w"  
 CBitmap*pOld=tdc.SelectObject(&bm); a2 >[0_E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); aiR5/ ZD  
 tdc.SelectObject(pOld); .wri5  
 BITMAP btm; 9[f%;WaS  
 bm.GetBitmap(&btm); o_:Qk;t  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /Su)|[/'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); zv9M HC &  
 BITMAPINFOHEADER bih; #J~Xv:LgD  
 bih.biBitCount=btm.bmBitsPixel; & >b+loF  
 bih.biClrImportant=0; ]|BojSL_  
 bih.biClrUsed=0; E(/ sXji!  
 bih.biCompression=0; 104!!m  
 bih.biHeight=btm.bmHeight; : ~'Z(-a  
 bih.biPlanes=1; S2}Z&X(  
 bih.biSize=sizeof(BITMAPINFOHEADER); ZV#$Z  
 bih.biSizeImage=size; 4@~a<P#  
 bih.biWidth=btm.bmWidth; qp1\I$Y  
 bih.biXPelsPerMeter=0; 4f jC  
 bih.biYPelsPerMeter=0; :tlE`BIp  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @{bb'q['@  
 static int filecount=0; 5h(jeT8"  
 CString name; u7(];  
 name.Format("pict%04d.bmp",filecount++); =f4< ({9  
 name=m_Path+name; h+xA?[ c=  
 BITMAPFILEHEADER bfh; 4a 4N C  
 bfh.bfReserved1=bfh.bfReserved2=0; B<C&ay  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /.2u.G  
 bfh.bfSize=54+size; e7's)C>/'  
 bfh.bfOffBits=54; {0fz9"|U  
 CFile bf; =?+w)(*0c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xtsL8-u f  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iRouLd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rV U:VL`2  
  bf.WriteHuge(lpData,size); 9C?cm:  
  bf.Close(); FRS28D  
  nCount++; DOT=U _  
 } 59K}  
 GlobalFreePtr(lpData); CnQg*+  
 if(nCount==1) xi.IRAZX  
  m_Number.Format("%d picture captured.",nCount); 2b!j.T#u  
 else edTMl;4  
  m_Number.Format("%d pictures captured.",nCount); i9y3PP)  
  UpdateData(FALSE); a.CF9m5]c  
} D8EeZUqU  
O*ImLR)i+s  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) A~XOK;sB  
{ >.LgsMRIKi  
 if(pMsg -> message == WM_KEYDOWN) RCQAtBd  
 { e|~C?Ow'J  
  if(pMsg -> wParam == VK_ESCAPE) QK'`=MU  
   return TRUE; "]w!`^'_  
  if(pMsg -> wParam == VK_RETURN) +>u>`|  
   return TRUE; h$|3dz N  
 } pIvfmIm  
 return CDialog::PreTranslateMessage(pMsg); 3)xbnRk  
} 8T<@ @6`T  
Z/n3aYM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [Ek42%  
{ )ib7K1GJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :TlAL# s&  
  SaveBmp(); w)^\_uAlS  
  return FALSE; Jxn3$  
} }E,jR=@  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ #>" }q3RO  
 CMenu pop; 2Gm-\o&Td"  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]L$4P y  
 CMenu*pMenu=pop.GetSubMenu(0); Hw y5G ;  
 pMenu->SetDefaultItem(ID_EXITICON); JxnuGkE0[#  
 CPoint pt; prwC>LE  
 GetCursorPos(&pt); P3i^S_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CJv> /#$/F  
 if(id==ID_EXITICON) xM%`K P.8X  
  DeleteIcon(); _HLC>pH~#  
 else if(id==ID_EXIT) /%5_~Jkr,  
  OnCancel(); ;m' '9z)2  
 return FALSE; E*OG-r   
} A3z/Bz4]:#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); YWSz84d  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =?HzNA$yh  
 AddIcon(); ,%[LwmET  
 return res; Oy:QkV9  
} TR~|c|B  
u0s'6=  
void CCaptureDlg::AddIcon() m$,cH>E  
{  WN$R[N  
 NOTIFYICONDATA data; RZW$!tyI=  
 data.cbSize=sizeof(NOTIFYICONDATA); %3rTQ:X  
 CString tip; r)OO&. P@j  
 tip.LoadString(IDS_ICONTIP); '7t|I6$ow  
 data.hIcon=GetIcon(0); [gpOu TW  
 data.hWnd=GetSafeHwnd(); ]GQv4-y  
 strcpy(data.szTip,tip); n>br,bQe  
 data.uCallbackMessage=IDM_SHELL; xC[~Fyhp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0r0c|*[+4z  
 data.uID=98; \QliHm!  
 Shell_NotifyIcon(NIM_ADD,&data); El'yiJ  
 ShowWindow(SW_HIDE); 75kKDR}6  
 bTray=TRUE; xrfPZBLy  
} h4tC. i~k  
r|*:9|y{"/  
void CCaptureDlg::DeleteIcon() R$Zv0a&  
{ |MR%{ZC^i  
 NOTIFYICONDATA data; 3R'.}^RN  
 data.cbSize=sizeof(NOTIFYICONDATA); E2Us#a  
 data.hWnd=GetSafeHwnd(); @+iC/  
 data.uID=98; 4 #aqz9k  
 Shell_NotifyIcon(NIM_DELETE,&data); %)8d{1at  
 ShowWindow(SW_SHOW); K*HCFqr U"  
 SetForegroundWindow(); K2*1T+?X  
 ShowWindow(SW_SHOWNORMAL); I$+%~4  
 bTray=FALSE; ax<g0=^R  
} LE8K)i  
w~4 z@/^"p  
void CCaptureDlg::OnChange() =x=1uXQv5  
{ nrF%wH/5  
 RegisterHotkey(); c/b%T  
} ('T4Db  
EbG_43SV  
BOOL CCaptureDlg::RegisterHotkey() m{vT_ei  
{ a_Z.J3  
 UpdateData(); tvTWZ`  
 UCHAR mask=0; y*}AX%8`e~  
 UCHAR key=0; O|? Z~  
 if(m_bControl) ?E%U|(S)=L  
  mask|=4; &aY/eD  
 if(m_bAlt) 5woIGO3X  
  mask|=2; KLG6QBkj  
 if(m_bShift) 4sj9Z:  
  mask|=1; +Y^-e.UO  
  key=Key_Table[m_Key.GetCurSel()]; h0T< :X   
 if(bRegistered){ EfFj!)fz  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F#jCEq  
  bRegistered=FALSE; y=-{Q  
 } A(q~{  
 cMask=mask; |VTWw<{LX  
 cKey=key; V/`#B$6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l{nB.m2  
 return bRegistered; )\um "l*\c  
} ^?E^']H)5u  
DhY;pG,t  
  四、小结 B1x'5S;Bq  
{'h)  
  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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