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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: <'A>7M~h?*  
  g+/%r91hZ  
  一、实现方法 !- f>*|@  
lJ]r %YlF  
  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: !f_GR Pj'  
5@c,iU-L  
#pragma data_seg("shareddata") zi:F/TlUC  
HHOOK hHook =NULL; //钩子句柄 /^96|  
UINT nHookCount =0; //挂接的程序数目 !8&,GT  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 a?'3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 E%ea o$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3ojK2F(1D  
static int KeyCount =0; .fcU&t  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |Y3!Lix  
#pragma data_seg() hZnT`!iFE^  
2'g< H-[  
  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。 =fMSmn1S  
O{8"f\*  
  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: ^ )N[x''a  
^&<~6y}U^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~\dpD  
cKey,UCHAR cMask) >_M}l @1  
{ >V(>2eD'S  
 BOOL bAdded=FALSE; Qu]0BVIe  
 for(int index=0;index<MAX_KEY;index++){ 43rM?_72  
  if(hCallWnd[index]==0){ H%7V)"  
   hCallWnd[index]=hWnd; RBx`<iBe  
   HotKey[index]=cKey; i]GBu  
   HotKeyMask[index]=cMask; !s,<h U#  
   bAdded=TRUE; c 5P52_@  
   KeyCount++; c?) pn9  
   break; 6A M,1  
  } l^xkXj  
 } qGkrG38K  
 return bAdded; q?z6|]M|u  
} $n `Zvl2  
//删除热键 Qpd-uC_Ni  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yp5*8g5  
{ }7hpx!s,  
 BOOL bRemoved=FALSE; j5z, l  
 for(int index=0;index<MAX_KEY;index++){ *F:]mgg  
  if(hCallWnd[index]==hWnd){ 'R_U,9y`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D,xWc|V  
    hCallWnd[index]=NULL; qt]QO1pAd  
    HotKey[index]=0; v,vTRrpK  
    HotKeyMask[index]=0; cNC\w%  
    bRemoved=TRUE; .Q"3 [  
    KeyCount--; OdQ >h$ gZ  
    break; o0-e,F>u  
   } XBhWj\`(T  
  } QOuy(GY  
 } bI[!y#_z4  
 return bRemoved; +WPi}  
} V.WfP*~NJ  
/6{`6(p  
B2d$!Any  
  DLL中的钩子函数如下: q<>2}[W  
UEo,:zeN[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }SitT\%  
{ w%S<N  
 BOOL bProcessed=FALSE; 5K'EuI)  
 if(HC_ACTION==nCode) oE#HI2X  
 { P},S[GaZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z+" :,#  
   switch(wParam) }#!o^B8  
   {  =)M8>>l  
    case VK_MENU: -Kg@Sj/U}R  
     MaskBits&=~ALTBIT; 'lC"wP&$  
     break; PkDL\Nqe  
    case VK_CONTROL: gZM{]GQ  
     MaskBits&=~CTRLBIT; L:Wy- Z  
     break; !qrF=a  
    case VK_SHIFT: 4NR,"l)  
     MaskBits&=~SHIFTBIT; dMGu9k~u  
     break; 3\=8tg p  
    default: //judge the key and send message HKOJkbVZ2^  
     break; -Qnnzp$]  
   } nWFp$tJ/R  
   for(int index=0;index<MAX_KEY;index++){ ^'EEry  
    if(hCallWnd[index]==NULL) :^%s oEi  
     continue; V EY!0PIj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @mP@~  
    {  >o.u,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7vr)JT=  
     bProcessed=TRUE; TeqFy(Dr  
    } RB/[(4  
   }  (i*1M  
  } K'?ab 0  
  else if((lParam&0xc000ffff)==1){ //有键按下 bG^eP :r  
   switch(wParam) 6FEtq,;0w  
   { /oiAAB27  
    case VK_MENU: /bCrpcH  
     MaskBits|=ALTBIT; fS#/-wugOB  
     break; &tMvs<q,  
    case VK_CONTROL: rA=F:N 2  
     MaskBits|=CTRLBIT; jv2l_  
     break; m.K"IXD  
    case VK_SHIFT: ]?``*{Zqy  
     MaskBits|=SHIFTBIT; ;k b^mJE  
     break; ls*^ 3^O  
    default: //judge the key and send message @TgCI`E   
     break; e}[$ =  
   } 4] ?  
   for(int index=0;index<MAX_KEY;index++){ yE"hgdL  
    if(hCallWnd[index]==NULL) )W57n)]  
     continue; ~fCD#D2KU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -HoPECe  
    { J=zZGd%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8w2+t>?  
     bProcessed=TRUE; ?9?0M A<[i  
    } X0vkdNgW  
   } D VSYH{U4  
  } S NK+U"Q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D%^EG8i n.  
   for(int index=0;index<MAX_KEY;index++){ \XRViG,|5  
    if(hCallWnd[index]==NULL) ?-@h Nrx  
     continue; &OI=r vDmo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .\U+`>4av  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Nq*\{rb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @.0jC=!l  
   } W!tP sPM  
  } [j93Mp  
 } Q8:u1$}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U +mx@C_  
} ' J-(v  
_|A)ueY  
  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: Z]SCIU @+  
Nm,v E7M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <[~x]-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hlz4f+#I  
$wN'mY  
  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: :eIB K  
m k -" U7;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v0$6@K;M4G  
{ 9MHb<~F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hJd#Gc~*M  
 { :nwcO3~`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 GuDus2#+  
  SaveBmp(); +,|-4U@dl  
  return FALSE; Wb4sfP_  
 } d9Q%GG0]  
 …… //其它处理及默认处理 /AMtT%91  
} 5lU`o  
!/jx4 w~R  
9l,Gd  
  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。 p^L6uM  
qbP[  9  
  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。 ^1Yx'ua'  
JWn9&WK  
  二、编程步骤 ;Rnb^t6Z  
"jeJV,%  
  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"; -Q$$2QW!  
5n9F\T5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; "%.#/!RG  
3}h&/KN{  
  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; a#raUF7e  
@#T?SNIL5  
  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; p O: EJ  
5T   
  5、 添加代码,编译运行程序。 ?L'k2J  
S>"dUM  
三、程序代码 ^ 1J;SO|  
=r_ S MTu  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Mb<KZ_wYOX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QPFpGS{d  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4uu*&B  
#if _MSC_VER > 1000 u*9C(je  
#pragma once }XXE hOO  
#endif // _MSC_VER > 1000 Ab(bvS8r$  
#ifndef __AFXWIN_H__ Cog:6Gnw  
#error include 'stdafx.h' before including this file for PCH F8=6!Qj  
#endif G4RsH/  
#include "resource.h" // main symbols ,U2D &{@  
class CHookApp : public CWinApp \/$v@5  
{ F(XWnfUv  
 public: &pmJ:WO,h  
  CHookApp(); hqBwA1](a  
  // Overrides |RjjP 7  
  // ClassWizard generated virtual function overrides \4vFEJSh  
  //{{AFX_VIRTUAL(CHookApp) xeHu-J!P  
 public: }Ns_RS$  
  virtual BOOL InitInstance(); db4&?55Q  
  virtual int ExitInstance(); 9Q.j <  
  //}}AFX_VIRTUAL zc2,Mn2  
  //{{AFX_MSG(CHookApp) yqBu7E$X  
  // NOTE - the ClassWizard will add and remove member functions here. Iy,)>V%iZV  
  // DO NOT EDIT what you see in these blocks of generated code ! K GI]W|T  
  //}}AFX_MSG b#y}VY)?  
  DECLARE_MESSAGE_MAP() QWxQD'L'  
}; )Tb;N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); pD>3c9J'^F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J`x9 XWYw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kh5V&%>?  
BOOL InitHotkey(); }BfwMq4E)n  
BOOL UnInit(); aSK$#Xeu  
#endif ,%jJ ,G,  
IcIMa  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ZtvU~'Q  
#include "stdafx.h" A5/h*`Q\\  
#include "hook.h" t)m4"p7  
#include <windowsx.h> 8ziYav  
#ifdef _DEBUG a%]p*X!  
#define new DEBUG_NEW 2xnOWW   
#undef THIS_FILE h T Xc0  
static char THIS_FILE[] = __FILE__; ]':C~-RV{  
#endif AVJF[t,  
#define MAX_KEY 100 q OXL(  
#define CTRLBIT 0x04 m0#hG x  
#define ALTBIT 0x02 w%ip"GT,  
#define SHIFTBIT 0x01 7dakj>JM  
#pragma data_seg("shareddata") C9nNziws  
HHOOK hHook =NULL; z^b\hR   
UINT nHookCount =0; -5qO}^i$a  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1";~"p2(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6 S&#8l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey asJYGqdF  
static int KeyCount =0; }.hBmhnZmI  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @%TQ/L^|  
#pragma data_seg() ECSC,oJ  
HINSTANCE hins; Hc+<(g   
void VerifyWindow(); S2NsqHJr  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +|0m6)J]  
//{{AFX_MSG_MAP(CHookApp) 49#-\=<gt  
// NOTE - the ClassWizard will add and remove mapping macros here. iKK=A.g  
// DO NOT EDIT what you see in these blocks of generated code! 3a5H<3w_  
//}}AFX_MSG_MAP givK{Yt<B  
END_MESSAGE_MAP() 4-"wFp  
Mfz5:'  
CHookApp::CHookApp() F?dTCa  
{ ?y '.sQ  
 // TODO: add construction code here, vbFAS:Y:+  
 // Place all significant initialization in InitInstance i3GvTg-X  
} iIT<{m&`  
"2h#i nS  
CHookApp theApp; lfKknp#B/O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ! of7]s  
{ jab]!eY  
 BOOL bProcessed=FALSE; K4rr.f6  
 if(HC_ACTION==nCode) t.zSJ|T_&O  
 { fg9sZ%67]\  
  if((lParam&0xc0000000)==0xc0000000){// Key up _I!Xr!!)a0  
   switch(wParam) 2Fh_  
   { & p%,+|  
    case VK_MENU: jmb\eOq+~V  
     MaskBits&=~ALTBIT; 63f/-64?7  
     break; 2ReulL8j  
    case VK_CONTROL: d}G?iX;c}  
     MaskBits&=~CTRLBIT; z~BB|-kp1  
     break; %MIu;u FR  
    case VK_SHIFT: = MXF`k^}  
     MaskBits&=~SHIFTBIT; she`_'?5  
     break; r" D|1  
    default: //judge the key and send message \xdt|:8  
     break; xvkof 'Q)  
   } yO6i "3  
   for(int index=0;index<MAX_KEY;index++){ -`RJ k(  
    if(hCallWnd[index]==NULL) Y!`?q8z$G  
     continue; V.4j?\#%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y >OZ<!`  
    { MPB6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zZxP= c  
     bProcessed=TRUE; <|8 l;  
    } }J*&()`  
   } ^4[\-L8Lpq  
  } )_=&)a1U  
  else if((lParam&0xc000ffff)==1){ //Key down oY] VP+b!  
   switch(wParam) 7Y)wu$!7}  
   { j\vK`.z  
    case VK_MENU: daorKW4  
     MaskBits|=ALTBIT; =.%ZF]Oe+#  
     break; q! ,do2T  
    case VK_CONTROL: D;L :a`Y  
     MaskBits|=CTRLBIT; ZMe|fn  
     break; 3x'30  
    case VK_SHIFT: X+3)DE\2  
     MaskBits|=SHIFTBIT; e\dT~)c  
     break; sV6A& Aw  
    default: //judge the key and send message 2eK\$_b_  
     break; y((_V%F}  
   } R*y[/Aw  
   for(int index=0;index<MAX_KEY;index++) .~8+s.y  
   { :+5afv}  
    if(hCallWnd[index]==NULL) {aL$vgYT1  
     continue; :}-u`K*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yI%> w4Z  
    { EzyIsp> _  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G225Nz;Y*  
     bProcessed=TRUE; yjO7/< 2  
    } 9JtvHUkO  
   } Po_OQJ:bd  
  } <7 rK  
  if(!bProcessed){ %8tN$8P  
   for(int index=0;index<MAX_KEY;index++){ vP4Ij  
    if(hCallWnd[index]==NULL) lEDHx[q  
     continue; Dmi;# WY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) </Id';|v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n96gDH*  
   } s`J=:>9*  
  } e^GW[lT  
 } {|gJC>f@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); VqrMi *W6  
} P~<93  
d{hYT\7~1(  
BOOL InitHotkey() ^zJ. W  
{ OW}A48X[+  
 if(hHook!=NULL){ StL[\9~:  
  nHookCount++; 5%`Ul  
  return TRUE; ~ t H s+  
 } tb{{oxa,k  
 else ,OCTm%6e  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Yel(}Ny  
  if(hHook!=NULL) 2P ?Iu&  
   nHookCount++; >>cd3)b  
  return (hHook!=NULL); Bg h$P  
} rsv!mY,Em  
BOOL UnInit() r8%,xA&  
{ C6M/$_l&a  
 if(nHookCount>1){ `.W;ptZ6  
  nHookCount--; DxgT]F%  
  return TRUE; gk1S"H  
 } orHD3T%&  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5r<(Z0  
 if(unhooked==TRUE){ j*u9+.   
  nHookCount=0; 0_ \ g  
  hHook=NULL; h /QP=Zd  
 } ug,|'<G+  
 return unhooked; 4Jr[8P0/A9  
} X@&uu0JJ  
/&d`c=nH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sri#L+I  
{ #6jwCEo=V  
 BOOL bAdded=FALSE; &] 6T^.  
 for(int index=0;index<MAX_KEY;index++){ --YUiNhh  
  if(hCallWnd[index]==0){ mJ>99:W+  
   hCallWnd[index]=hWnd; /&:9VMMj  
   HotKey[index]=cKey; j2 ^T:q[  
   HotKeyMask[index]=cMask; $-?5Q~  
   bAdded=TRUE; !#I/be]  
   KeyCount++; +fQL~ 0tA  
   break; u^$Md WP  
  } i{ @'\}{L  
 } +i#sS19h  
 return bAdded; TQd FC\@f"  
} FqxOHovE  
><MgIV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  Gy6 qLM  
{ }!<cph  
 BOOL bRemoved=FALSE; w a<C*o  
 for(int index=0;index<MAX_KEY;index++){ {U '&9_y  
  if(hCallWnd[index]==hWnd){ fsc~$^.~\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DIp:S&q2  
    hCallWnd[index]=NULL; "ue$DyN  
    HotKey[index]=0; #Rx"L&3Ue  
    HotKeyMask[index]=0; w LN2`ucC  
    bRemoved=TRUE; So *Wk "  
    KeyCount--; @1&;R  
    break; Fg\| e%  
   } \ e8*vos  
  } nYy}''l<  
 } KbdfSF$  
 return bRemoved; HL}~W}!j  
} % rY8  
>^f)|0dn)E  
void VerifyWindow() .S'fM]_#  
{ %Fg8l{H3  
 for(int i=0;i<MAX_KEY;i++){ ,e FQ}&^A  
  if(hCallWnd!=NULL){ N%r L=zE  
   if(!IsWindow(hCallWnd)){ FgQ_a/*  
    hCallWnd=NULL; fk7Cf"[w  
    HotKey=0; NZC='3Uz  
    HotKeyMask=0; B/D\gjb  
    KeyCount--; ,V]A63J  
   } RvSq KW8  
  } +F~0\#d  
 } &<V_[Wh"  
} ;#yu"6{  
QS [B  
BOOL CHookApp::InitInstance() uWB:"&!^  
{ zt[4_;2Y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *Iwk47J ;a  
 hins=AfxGetInstanceHandle(); |] !o*7"4  
 InitHotkey(); mOgOHb2  
 return CWinApp::InitInstance(); q$?7 ~*M;x  
} uz#PBV8Q  
q_]   
int CHookApp::ExitInstance() )ehB)X  
{ $JhZ'Z  
 VerifyWindow(); k=mT!  
 UnInit(); uH&,%k9GVK  
 return CWinApp::ExitInstance(); {eswe  
} :DMHezaU  
-RH4y 2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Z&]+A,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s1Tl.p5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,|. *,  
#if _MSC_VER > 1000 FQ^<,  
#pragma once l!;_lH8W$  
#endif // _MSC_VER > 1000 F!)M<8jL&9  
Z cTL#OTP  
class CCaptureDlg : public CDialog c2/R]%`)9  
{ EID)o[<  
 // Construction <p^*Ydx  
 public: nGv23R(?G  
  BOOL bTray; 2z.8rNwT  
  BOOL bRegistered; " _:iK]  
  BOOL RegisterHotkey(); +% XhQ  
  UCHAR cKey; ,_Qe}qFU  
  UCHAR cMask; XewXTd #x  
  void DeleteIcon(); s("Cn/ZkS  
  void AddIcon(); ;5D @kS^  
  UINT nCount; 2E3?0DL",  
  void SaveBmp(); U1>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O2q=gYX>\  
  // Dialog Data \]U<hub  
  //{{AFX_DATA(CCaptureDlg) hC|5e|S  
  enum { IDD = IDD_CAPTURE_DIALOG }; @L[PW@:SZ  
  CComboBox m_Key; /lr1hW~Dbk  
  BOOL m_bControl; K_AtU/  
  BOOL m_bAlt; 8<yV  
  BOOL m_bShift; X;OsH  
  CString m_Path; ]g>m?\'n  
  CString m_Number; T/GgF&i3  
  //}}AFX_DATA \)^,PA3  
  // ClassWizard generated virtual function overrides 0q[p{_t`  
  //{{AFX_VIRTUAL(CCaptureDlg) N)y^</Ya  
 public: ~m?74^ i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]&C:>  
 protected: FDF3zzP0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <.r ]dCf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qe5tcv}u  
  //}}AFX_VIRTUAL stg30><  
  // Implementation >'} Y1_S5  
 protected: U|Bsa(?nx  
  HICON m_hIcon; )IFl 0<d  
  // Generated message map functions ;wJ7oj<  
  //{{AFX_MSG(CCaptureDlg) smfG, TI  
  virtual BOOL OnInitDialog(); #~H%[ sa  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Uz6{>OCvk|  
  afx_msg void OnPaint(); c~gNH%1XN  
  afx_msg HCURSOR OnQueryDragIcon(); 'v\1:zi  
  virtual void OnCancel(); &/ >;LgN  
  afx_msg void OnAbout(); 0" U5oP[  
  afx_msg void OnBrowse(); "UQr:/  
  afx_msg void OnChange(); ),cQUB  
 //}}AFX_MSG (s}Rj)V[^  
 DECLARE_MESSAGE_MAP() aF&r/j+}o  
}; SON ^CvMs{  
#endif ; x:k-s2-  
6R1wn&8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ny12U;'s,  
#include "stdafx.h" (dzH3_U  
#include "Capture.h" J3/\<=Qh  
#include "CaptureDlg.h" [x;(cISK1  
#include <windowsx.h> Ku<b0<`  
#pragma comment(lib,"hook.lib") gYTyH.  
#ifdef _DEBUG 2{A;du%&  
#define new DEBUG_NEW ,|T*|2Gm  
#undef THIS_FILE (3 IZ  
static char THIS_FILE[] = __FILE__; {S5RK-ax  
#endif L6|Hgrj-u  
#define IDM_SHELL WM_USER+1 wGEWr2$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #4P8Rzl$/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dtB[m^$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ==%`e/~Y  
class CAboutDlg : public CDialog .S~@BI(|<  
{ L;/9L[s,  
 public: LP.HS'M~u  
  CAboutDlg(); $|4cJ#;^L  
  // Dialog Data ;_mgiKHg  
  //{{AFX_DATA(CAboutDlg) ]3n, AHA  
  enum { IDD = IDD_ABOUTBOX }; c3=-Mq9Q  
  //}}AFX_DATA ,>D ja59  
  // ClassWizard generated virtual function overrides 8[8|*8xqs  
  //{{AFX_VIRTUAL(CAboutDlg) oN *SRaAp  
 protected: kQ@gO[hS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UZzNVIXA%  
  //}}AFX_VIRTUAL ]i-P-9PA4  
  // Implementation ^I]LoG:  
 protected: P@qMJ}<j  
  //{{AFX_MSG(CAboutDlg) 7~_{.f  
  //}}AFX_MSG Yo>`h2C4  
  DECLARE_MESSAGE_MAP() x&at^Fp  
}; CQ@LmTW[  
$Mdbt o~<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (C,e6r Y  
{ U(U@!G)  
 //{{AFX_DATA_INIT(CAboutDlg) &Fw[YGJayz  
 //}}AFX_DATA_INIT `TUZZz  
} 'S =sj}X  
1TKEm9j]u  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $aB /+,  
{ <f%ujrX  
 CDialog::DoDataExchange(pDX); +"jl(5Q  
 //{{AFX_DATA_MAP(CAboutDlg) ;avQ1T'{?g  
 //}}AFX_DATA_MAP 3\;v5D:  
} d)N^PJ/  
ZB-QABn  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Fj S%n$  
 //{{AFX_MSG_MAP(CAboutDlg) ,mBZ`X@N  
 // No message handlers :.Y|I[\E%  
 //}}AFX_MSG_MAP dVa!.q_3  
END_MESSAGE_MAP() DhZ:#mM{  
e"]"F{Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Eu|sWdmf l  
: CDialog(CCaptureDlg::IDD, pParent) TI}}1ScA'  
{ {S G*  
 //{{AFX_DATA_INIT(CCaptureDlg) *D2Nm9sl  
  m_bControl = FALSE; t5xb"F   
  m_bAlt = FALSE; v2d<o[[C  
  m_bShift = FALSE;  Do|]eD  
  m_Path = _T("c:\\"); vB^uxdt|m  
  m_Number = _T("0 picture captured."); ]fj-`==  
  nCount=0; ^V[/(Lq  
  bRegistered=FALSE; )CJES!! W  
  bTray=FALSE; Re>AsnA[  
 //}}AFX_DATA_INIT l09Fn>wa  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 "u_i[[y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m+?N7  
} 5L F/5`  
[!EXMpq'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hR-K@fS%l'  
{ aR _NyA  
 CDialog::DoDataExchange(pDX); qP7G[%=v  
 //{{AFX_DATA_MAP(CCaptureDlg) WJfES2N  
  DDX_Control(pDX, IDC_KEY, m_Key); *.oKI@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); W;4Lkk$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Ejv%,q/T(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); cph~4wCS[U  
  DDX_Text(pDX, IDC_PATH, m_Path); -;$nb~y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;J]25j]]  
 //}}AFX_DATA_MAP w!\3ICB  
} %,/lqcFo  
N>0LQ MI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) k'Gw!p}  
//{{AFX_MSG_MAP(CCaptureDlg) -ey)J +?t  
 ON_WM_SYSCOMMAND() TjxA#D)   
 ON_WM_PAINT() L1sqU-gt  
 ON_WM_QUERYDRAGICON() $/+so;KD  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %#u.J  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) l;OYUq~F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [>f]@>  
//}}AFX_MSG_MAP 6gnbkpYi  
END_MESSAGE_MAP() Z0$] tS  
Z0-ytODI I  
BOOL CCaptureDlg::OnInitDialog() &R,9+c  
{ 1_uvoFLk  
 CDialog::OnInitDialog(); eX"''PA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eJHp6)2  
 ASSERT(IDM_ABOUTBOX < 0xF000); 6g"C#&{@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); >"%ob,c:#  
 if (pSysMenu != NULL) f8=]oa]  
 { 6W&_2a7*  
  CString strAboutMenu; ?1peF47Z  
  strAboutMenu.LoadString(IDS_ABOUTBOX); *t(4 $  
  if (!strAboutMenu.IsEmpty()) Mu{BUtkzG  
  { g\Ak;03n  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9C/MRmv`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v>H=,.`0\  
  } D<bI2  
 } G(/DtY]  
 SetIcon(m_hIcon, TRUE); // Set big icon %?9Ok  
 SetIcon(m_hIcon, FALSE); // Set small icon z\TLsx  
 m_Key.SetCurSel(0); ^z~~VBv  
 RegisterHotkey(); @E%DP9.I  
 CMenu* pMenu=GetSystemMenu(FALSE); L[y Pjw:0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )#C mQXgG  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); RF?DtNuq  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L&kr{7q  
 return TRUE; // return TRUE unless you set the focus to a control X`:'i?(yj  
} <^8*<;PaG  
(?>cn_m  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) + BL{@,zr  
{ $ J1f.YE  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -:<lkq&/  
 { [|RjHGf  
  CAboutDlg dlgAbout; )K;]y-Us[  
  dlgAbout.DoModal(); kccWoU,  
 } Y/fJQ6DY  
 else HbM0TXo  
 { l +'F_a  
  CDialog::OnSysCommand(nID, lParam);  \S4SI  
 } mrM4RoO  
} Qhn;`9+L  
fvqd'2 t  
void CCaptureDlg::OnPaint() })Yv9],6  
{ P`(Mk6gE  
 if (IsIconic()) lr~0pL  
 { *jITOR!uF`  
  CPaintDC dc(this); // device context for painting <+v{GF#R  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o&SSv W  
  // Center icon in client rectangle pf&ag#nr  
  int cxIcon = GetSystemMetrics(SM_CXICON); t Rm+?  
  int cyIcon = GetSystemMetrics(SM_CYICON); s^hR\iY  
  CRect rect; j}f[W [2  
  GetClientRect(&rect); HC*?DJ,  
  int x = (rect.Width() - cxIcon + 1) / 2; RLVAT M5  
  int y = (rect.Height() - cyIcon + 1) / 2; lG:kAtx4  
  // Draw the icon ,<` )>2 'o  
  dc.DrawIcon(x, y, m_hIcon); )OP){/   
 } 8e&p\%1  
 else S,{tV=&m]  
 { ]Oeh=gq  
  CDialog::OnPaint(); @Jn!0Y1_3  
 } 7TX2&kMoc  
} xZ.!d.rn  
np9dM  
HCURSOR CCaptureDlg::OnQueryDragIcon() MYdO jcN  
{ 56}X/u  
 return (HCURSOR) m_hIcon; h8{(KRa6  
} B&0; 4  
=&nW~<- v  
void CCaptureDlg::OnCancel() @'6"7g  
{ /=:j9FF  
 if(bTray) C! 9}  
  DeleteIcon(); ztll}  
  CDialog::OnCancel(); 5B4Ssrs5W~  
} %,P >%'0  
*ZrSiIPP  
void CCaptureDlg::OnAbout() !t#F/C  
{ xHA0gZf  
 CAboutDlg dlg; sG7u}r  
 dlg.DoModal(); mtAE  
} ?C-Towo=i  
Ib=x~za@n  
void CCaptureDlg::OnBrowse() q v*7K@  
{ @N@F,~[RR2  
 CString str; 3gEMRy*+  
 BROWSEINFO bi; 9=`Wp6Gmn  
 char name[MAX_PATH]; bulS&dAX  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); YJeyIYCs<  
 bi.hwndOwner=GetSafeHwnd(); #5} wuj%5  
 bi.pszDisplayName=name; YJV%a  
 bi.lpszTitle="Select folder"; .a'f|c6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7gF"=7{-  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O+q/4  
 if(idl==NULL) ^teq[l$;  
  return; 6%G-Vs]*2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~`ny @WD9  
 str.ReleaseBuffer(); };L ^w :  
 m_Path=str; _}xd}QW  
 if(str.GetAt(str.GetLength()-1)!='\\') I:cg}JZ>|  
  m_Path+="\\"; AIYmS#V1W2  
 UpdateData(FALSE); !]yO^Ob.E  
} KngTc(^_D  
942lSyix  
void CCaptureDlg::SaveBmp() =q7Z qP  
{ FS6`6M.K  
 CDC dc;  as yZe  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); {i0SS  
 CBitmap bm; ]:M0Kj&h  
 int Width=GetSystemMetrics(SM_CXSCREEN); H,unpZ(  
 int Height=GetSystemMetrics(SM_CYSCREEN); I#F!N6;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w8S!%abl1  
 CDC tdc; k <iTjI*N  
 tdc.CreateCompatibleDC(&dc); n{*D_kM(H  
 CBitmap*pOld=tdc.SelectObject(&bm); "*1 f;+\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); fxaJZz$o  
 tdc.SelectObject(pOld); Z<[<n0o1  
 BITMAP btm; \JEXX4%  
 bm.GetBitmap(&btm); m,i,n9C->  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pKiZ)3U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); N["W I r  
 BITMAPINFOHEADER bih; nAIo{ F  
 bih.biBitCount=btm.bmBitsPixel; s#~GH6/  
 bih.biClrImportant=0; YHkcWz  
 bih.biClrUsed=0; E>'a,!QPv  
 bih.biCompression=0; c/N@zum,{  
 bih.biHeight=btm.bmHeight; "5R~(+~<@  
 bih.biPlanes=1; \MC-4Yz  
 bih.biSize=sizeof(BITMAPINFOHEADER); EP'h@zdz  
 bih.biSizeImage=size; q;g>t5]a  
 bih.biWidth=btm.bmWidth; l/TjQ*  
 bih.biXPelsPerMeter=0; Z;Ez"t&U  
 bih.biYPelsPerMeter=0; [qUN4x5b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); MTg:dR_  
 static int filecount=0; a7zcIwk '{  
 CString name; . o7m!  
 name.Format("pict%04d.bmp",filecount++); `nM/l @  
 name=m_Path+name; o8/ ;;*  
 BITMAPFILEHEADER bfh; KqBk~-G  
 bfh.bfReserved1=bfh.bfReserved2=0; #} ~qqJ G2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -}O1dEn.  
 bfh.bfSize=54+size; vE@!{*  
 bfh.bfOffBits=54; {vUN+We  
 CFile bf; &,A64y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?Nf>]|K:Q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C2LL|jp*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); An;MVA  
  bf.WriteHuge(lpData,size); 5pr"d@.  
  bf.Close(); MYJg8 '[j  
  nCount++; _v Sn`  
 } drzL.@h|  
 GlobalFreePtr(lpData); :I -V_4b  
 if(nCount==1) \PDd$syDA  
  m_Number.Format("%d picture captured.",nCount); NI#X @  
 else NH$r Z7$  
  m_Number.Format("%d pictures captured.",nCount); \^ghdU  
  UpdateData(FALSE); Dd;Nz  
} JlMT<;7\  
#e' }.4cr  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -F'b8:m  
{ 8Ac)'2t;U  
 if(pMsg -> message == WM_KEYDOWN) Ox#\M0Wn$3  
 { 3_~cMlr3T.  
  if(pMsg -> wParam == VK_ESCAPE) yjfat&$  
   return TRUE; Eskb9^A  
  if(pMsg -> wParam == VK_RETURN) 7VcmVq}X  
   return TRUE; ~U;rw&'H  
 } S*j6OwZ  
 return CDialog::PreTranslateMessage(pMsg); IDnC<MO>  
} 'smWLz}  
8} =JKR^cK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ono4U.C9  
{ PH"n{lW.T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5>BK%`  
  SaveBmp(); >2bKSh  
  return FALSE; PV|uPuz  
} [2"<W! p  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T]2q?; N  
 CMenu pop; :'#TCDlOb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TXe$<4"  
 CMenu*pMenu=pop.GetSubMenu(0); XsnF~)YW  
 pMenu->SetDefaultItem(ID_EXITICON); ylt`*|$  
 CPoint pt; /pF `8$  
 GetCursorPos(&pt); :0s]U_h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); x|yEt O&  
 if(id==ID_EXITICON) N<QXmgqx  
  DeleteIcon(); c478P=g=5  
 else if(id==ID_EXIT) Yjx|9_|Xn  
  OnCancel(); v) vkn/:  
 return FALSE; pdE3r$C  
} `rf_7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +$oF]OO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Eb=}FuV  
 AddIcon(); ^Z:~91Tv-_  
 return res; jDQZQ NS  
} e{m2l2Tx:  
 -_`>j~  
void CCaptureDlg::AddIcon() ,o)d3g-&g  
{ %-d]X{J:  
 NOTIFYICONDATA data; um9_ru~  
 data.cbSize=sizeof(NOTIFYICONDATA); T49zcJf;  
 CString tip; g!-,]  
 tip.LoadString(IDS_ICONTIP); 4;2< ^[M  
 data.hIcon=GetIcon(0); o6V}$wT3J  
 data.hWnd=GetSafeHwnd(); H^YSJ 6  
 strcpy(data.szTip,tip); #dM9pc jh  
 data.uCallbackMessage=IDM_SHELL; P2bZ65>3y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $@UN4B?y  
 data.uID=98; :=J,z,H_U  
 Shell_NotifyIcon(NIM_ADD,&data); jQ:OKh<Y  
 ShowWindow(SW_HIDE); d/i`l*  
 bTray=TRUE; &197P7&o  
} xQUu|gtL4  
!Q#{o^{Y~  
void CCaptureDlg::DeleteIcon() m=YU2!Mb  
{ K_dOq68_  
 NOTIFYICONDATA data; kT;S4B  
 data.cbSize=sizeof(NOTIFYICONDATA); -wjN"g<  
 data.hWnd=GetSafeHwnd(); F&&$Qn_+  
 data.uID=98; 3YVi" k?2  
 Shell_NotifyIcon(NIM_DELETE,&data); -|E!e.^7:  
 ShowWindow(SW_SHOW); OoWyPdC+P  
 SetForegroundWindow(); 'Fmvu   
 ShowWindow(SW_SHOWNORMAL); o<N  nV  
 bTray=FALSE; Y.*y9)#S6  
} /iX+R@  
0{= `on;  
void CCaptureDlg::OnChange() ,T2G~^0  
{ *8LMn   
 RegisterHotkey(); 7}X[ 4("bB  
} 3D2E?$dX  
U~pV)J  
BOOL CCaptureDlg::RegisterHotkey() () j =5KDu  
{ )kP5u`v  
 UpdateData(); '_V2!?+RU+  
 UCHAR mask=0; t^w"w`v\u  
 UCHAR key=0; p\bDY  
 if(m_bControl) xXM{pd  
  mask|=4; utIX  %0  
 if(m_bAlt) Nqu>6^-z0  
  mask|=2; o_'p3nD  
 if(m_bShift) C+TI]{t  
  mask|=1; )a-Du$kd  
  key=Key_Table[m_Key.GetCurSel()]; "sG=wjcw^  
 if(bRegistered){ ariLG [:X  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nJo`B4'U  
  bRegistered=FALSE; NUp<e%zB  
 } %@u;5qD&  
 cMask=mask; Sv +IS  
 cKey=key; rnF/H=I/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p>upA)W]  
 return bRegistered; d!$Z (W0  
} 7k rUKYVo  
Z:*76PP,  
  四、小结 <N%7|t*eT  
#W|'1 OX4  
  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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