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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: TS`m&N{i")  
  '0^lMQMg  
  一、实现方法 HWIn.ij  
'pyIMB?x  
  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:  od$$g(  
pHowioFx  
#pragma data_seg("shareddata") n2dOCntN>  
HHOOK hHook =NULL; //钩子句柄 DQ}&J  
UINT nHookCount =0; //挂接的程序数目 o=RxQk1N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TV|Z$,6l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 qC=9m[MI  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 37biRXqLH  
static int KeyCount =0; aTfc>A;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <I*N=;7  
#pragma data_seg() g\9&L/xDN  
m7`S@qG  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 )6BySk  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: mG1!~}[  
A>,kmU5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3kh!dL3D  
cKey,UCHAR cMask) WL|71?@C  
{ :`K2?;DC8  
 BOOL bAdded=FALSE; NiEz3ODSi  
 for(int index=0;index<MAX_KEY;index++){ v-8{mK`9\  
  if(hCallWnd[index]==0){ ([|^3tM  
   hCallWnd[index]=hWnd; ~;-2eKw  
   HotKey[index]=cKey; ~c5 5LlO>  
   HotKeyMask[index]=cMask; ~Y{]yBGoF  
   bAdded=TRUE; x[fp7*TiG  
   KeyCount++; 7L!}F;yT  
   break; 0$NzRPbH  
  } r oPC ^Q  
 } PT~F ^8,)  
 return bAdded; >Hmho'  
} me F.  
//删除热键 y<~(}xsHh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  ^Y!$WP  
{ H]*B5Jv~  
 BOOL bRemoved=FALSE; oGyoU#z#  
 for(int index=0;index<MAX_KEY;index++){ 4`'Rm/)  
  if(hCallWnd[index]==hWnd){ dKP| TRd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EuA352x  
    hCallWnd[index]=NULL; ?9 W2ax-4  
    HotKey[index]=0; eoFG$X/PO  
    HotKeyMask[index]=0; xnJ#}-.7  
    bRemoved=TRUE; z:N?T0b(  
    KeyCount--; 4jlwu0L+  
    break; BpGyjo J2  
   } tk)}4b^\%j  
  } :?}> Q  
 } `9k\~D=D~  
 return bRemoved; 3''Uxlo\  
} T24$lhM  
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  DLL中的钩子函数如下: eL'fJcjw<  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fB&i{_J  
{ zsj]WP6 j  
 BOOL bProcessed=FALSE; z =\ENG|x#  
 if(HC_ACTION==nCode) VZe'6?#  
 { _{ 2`sL)  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 kyZZ0  
   switch(wParam) ONZ(0H{ 1$  
   {  ~]Av$S  
    case VK_MENU: _,v>P2)  
     MaskBits&=~ALTBIT; hhhxsGyv  
     break; @$CPTv3e  
    case VK_CONTROL: 6(7dr?^eGT  
     MaskBits&=~CTRLBIT; ;mr*$Iu7|  
     break; >L8 & 6aU  
    case VK_SHIFT: N/b$S@  
     MaskBits&=~SHIFTBIT; ~eS/gF?  
     break; k nzo6  
    default: //judge the key and send message tkff\W[JU  
     break; &h.?~Ri  
   } %tPy]{S..  
   for(int index=0;index<MAX_KEY;index++){ aI|X~b  
    if(hCallWnd[index]==NULL) ![eY%2;<  
     continue; 1bDAi2 H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &LG|YvMY6  
    { Ji1#>;&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wzmQRn;s  
     bProcessed=TRUE; 3[?;s}61  
    } O2f-{jnTz,  
   } E$A=*-u  
  } @7;}6,)  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q'hs,t1<  
   switch(wParam) h Fan$W$  
   { (]VY==t~  
    case VK_MENU: Au{b1n  
     MaskBits|=ALTBIT; 90-s@a3B-j  
     break; Z N&9qw*  
    case VK_CONTROL: A;6ew4  
     MaskBits|=CTRLBIT; T-iQ!D~  
     break; meXwmO  
    case VK_SHIFT: |N3#of(  
     MaskBits|=SHIFTBIT; %sPq*w.  
     break; yigq#h^  
    default: //judge the key and send message YN7O Qqa  
     break; cBU3Q<^  
   } hBifn\dFr  
   for(int index=0;index<MAX_KEY;index++){ 'c]Pm,Ls  
    if(hCallWnd[index]==NULL) 9l|*E  
     continue; L s3r( Tf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &m]jYvRc  
    { ;?TM_%>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V&/Cb&~Uw  
     bProcessed=TRUE; e~9g~k]s  
    } ~BE=z:  
   } :~ &#9  
  }  tO D}&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &' y}L'  
   for(int index=0;index<MAX_KEY;index++){ B?e] Ht  
    if(hCallWnd[index]==NULL) r%>7n,+o  
     continue; K(?p]wh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kbbHa_;aqV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rt?*eC1b+Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aZ|S$-}  
   } MX+gc$Y O  
  } ?(}~[  
 } h&!$ `)   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z Y5Pf 1  
} !t{  
JW=q'ibR  
  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: /)dyAX(  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,% .)mf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H|MAbx 7  
[A] +Azc  
  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: t1$pl6&,  
jR+k x:+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) NSR][h_  
{ cFq2 6(e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \JCpwNT{P  
 {  H =&K_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ZsYY)<n  
  SaveBmp(); l&m Y}k  
  return FALSE; v0bP|h[t  
 } HV]u9nrt#  
 …… //其它处理及默认处理 9Sa6v?sRor  
} xK5~9StP  
7xO~v23oe  
7&w[h4Lw  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 n;:C{5  
=rkW325O  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 g@>93j=cZU  
myd:"u,}9  
  二、编程步骤 nyOmNvZf  
rd=+[:7L  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Gq%,'am f  
N0ef5J JM`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :KGPQ@:O  
hx4c`fOs  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; X+N8r^&  
k @gQY_  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; @~&^1%37)  
gkca{BJ   
  5、 添加代码,编译运行程序。 D^U?!S&4~  
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三、程序代码 WZP1g kX&M  
k 6i&NG6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL KYl!Iw67d  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [8Z !dj   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ xX Dj4j,  
#if _MSC_VER > 1000 [81q 0@  
#pragma once [F{P0({%?  
#endif // _MSC_VER > 1000 OsRizcgdA  
#ifndef __AFXWIN_H__ UgZL<}  
#error include 'stdafx.h' before including this file for PCH g'2; ///  
#endif UA*Kuad  
#include "resource.h" // main symbols ep*8*GmP  
class CHookApp : public CWinApp X/m~^  
{ ^f,%dM=i=  
 public: Blj<|\ igc  
  CHookApp(); \6aisK  
  // Overrides =Tfm~+7nE  
  // ClassWizard generated virtual function overrides r$x;rL4  
  //{{AFX_VIRTUAL(CHookApp) CT'#~~QB  
 public: XPnHi@x  
  virtual BOOL InitInstance(); $s 'n]]Wq  
  virtual int ExitInstance(); 9kbczL^Y  
  //}}AFX_VIRTUAL 6fC Hd10!  
  //{{AFX_MSG(CHookApp) M 5`hMfg  
  // NOTE - the ClassWizard will add and remove member functions here. 2R;#XmKS  
  // DO NOT EDIT what you see in these blocks of generated code ! x,fL656t  
  //}}AFX_MSG WSGho(\  
  DECLARE_MESSAGE_MAP() 0Fsa&<{6?  
}; .S4%Q9l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); GLMpWD`Wo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dz8aJ6g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }KEr@h,N  
BOOL InitHotkey(); *u< ZQq  
BOOL UnInit(); )#`&[9d-  
#endif bU/YU0ZIT  
'T;;-M3*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -D%mVe)&+  
#include "stdafx.h" Ry?f; s  
#include "hook.h" ~mv5{C  
#include <windowsx.h> ^ohIJcI-  
#ifdef _DEBUG ksUF(lYk  
#define new DEBUG_NEW Q^* 3 3  
#undef THIS_FILE }d5~w[  
static char THIS_FILE[] = __FILE__; O]Y   z7  
#endif r @ !  
#define MAX_KEY 100 H?V b   
#define CTRLBIT 0x04 6)>otB8)J  
#define ALTBIT 0x02 U\-R'Z>M  
#define SHIFTBIT 0x01 rZ2cC#  
#pragma data_seg("shareddata") aP"!}*  
HHOOK hHook =NULL; ${gO=Z  
UINT nHookCount =0; ?},RN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n9R0f9:*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8xkLfN|N=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey U *go}dt"5  
static int KeyCount =0; U"~W3vwJ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift KleiX7  
#pragma data_seg() 5 Yww,s  
HINSTANCE hins; io@f5E+?  
void VerifyWindow(); *.Z~f"SZy*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) eo.B0NZsF  
//{{AFX_MSG_MAP(CHookApp) ,zxv>8Nt  
// NOTE - the ClassWizard will add and remove mapping macros here. \Pe+]4R-Xo  
// DO NOT EDIT what you see in these blocks of generated code! J"TF@7{p  
//}}AFX_MSG_MAP X}g3[  
END_MESSAGE_MAP() ,,BWWFg~  
`; j$]  
CHookApp::CHookApp() 3e1P!^'\  
{ w"? RbA  
 // TODO: add construction code here, : LT'#Q8  
 // Place all significant initialization in InitInstance TO G:N~  
} ;mPX8bT  
tg\o"QKW9  
CHookApp theApp; P]armg%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b[:{\ !I  
{ _KkP{g,Y  
 BOOL bProcessed=FALSE; &:1q3 gDm  
 if(HC_ACTION==nCode) usC$NVdm  
 { 7:<A_OLi  
  if((lParam&0xc0000000)==0xc0000000){// Key up +oL@pp0  
   switch(wParam) \1QY=}  
   { G.PRPl  
    case VK_MENU: 'K#ndCGJ$  
     MaskBits&=~ALTBIT; %joL}f[  
     break; JV_VM{w{K  
    case VK_CONTROL: f[ia0w5 m  
     MaskBits&=~CTRLBIT;  T;V!>W37  
     break; DgY !)cS  
    case VK_SHIFT: |"+Uf w^  
     MaskBits&=~SHIFTBIT; mkl^2V13~  
     break; 1I)oT-~  
    default: //judge the key and send message C2\zbC[qm  
     break; T''<yS  
   } NB+/S;`  
   for(int index=0;index<MAX_KEY;index++){ m(0X_& &?z  
    if(hCallWnd[index]==NULL) uL^`uI#I  
     continue; 7!\zo mx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |=MhI5gsx  
    { B-PX/Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5L_`Fw\l  
     bProcessed=TRUE; v G9>e&Be  
    } "\ =Phqw   
   } cLw|[!5:  
  } `*D"=5G+  
  else if((lParam&0xc000ffff)==1){ //Key down m;t&P58f  
   switch(wParam) 8_"NF%%(n  
   { (OA4H1DL^  
    case VK_MENU: )4m`Ya,E3  
     MaskBits|=ALTBIT; kg\8 (@h]  
     break; <Y2$'ETD  
    case VK_CONTROL: \O\q1 s~  
     MaskBits|=CTRLBIT; ncUS8z  
     break; GR4DxlX  
    case VK_SHIFT: ZY@ntV?  
     MaskBits|=SHIFTBIT; > >KCd  
     break; Ps{vN ~}  
    default: //judge the key and send message %l6E0[   
     break; c*\;!dbP  
   } bdG@%K',  
   for(int index=0;index<MAX_KEY;index++) +.OdrvN4)  
   { HrfS^B  
    if(hCallWnd[index]==NULL) 9%1J..c  
     continue; P,9Pn)M|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m^=El7+  
    { N/--6)5~0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T[#q0bv  
     bProcessed=TRUE; ?~!9\dek,  
    } n?;rWq"  
   } e =r  b  
  }  K[LuvS  
  if(!bProcessed){ $*T?}r>  
   for(int index=0;index<MAX_KEY;index++){ >P&1or)e%  
    if(hCallWnd[index]==NULL) 5t"FNL <(M  
     continue; DfP-(Lm)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Iy&,1CI"]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WqF$-rBJG^  
   } 0!7p5  
  } ! Dj2/][  
 } R n]xxa'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +jyGRSo  
} X6 N&:<  
7 nFOV Z  
BOOL InitHotkey() Am_>x8z  
{ ZfK[o{9>  
 if(hHook!=NULL){ !?/:p.  
  nHookCount++; P^48]Kj7  
  return TRUE; :9Jy/7/  
 } /zoy,t-i  
 else ??U/Qi180  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); cD}]4  
  if(hHook!=NULL) H-U_  
   nHookCount++; V)N{Fr)&  
  return (hHook!=NULL); ] _5b   
} 3 yy5 l!fv  
BOOL UnInit() 7(N+'8  
{ <aDZ{T%  
 if(nHookCount>1){ G\TO ]c  
  nHookCount--; 2E[7RBFY+\  
  return TRUE; I[d<SHo  
 } $LFL4Q  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %yu =,J j  
 if(unhooked==TRUE){ $Ery&rX.  
  nHookCount=0; J9p4\=9  
  hHook=NULL; H;l_;c`  
 } a6^_iSk  
 return unhooked; 2vX $:4  
} T'@+MA) ~  
>m. .  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oPM*VTMA  
{ #j=yQrJ  
 BOOL bAdded=FALSE; G{E`5KIvm  
 for(int index=0;index<MAX_KEY;index++){ ^B% =P  
  if(hCallWnd[index]==0){ l-l7jq]R  
   hCallWnd[index]=hWnd; V 3cKbk7~  
   HotKey[index]=cKey; nS*Y+Q^9a  
   HotKeyMask[index]=cMask; % hvK;B?Y|  
   bAdded=TRUE; Jk6}hUH,  
   KeyCount++; \m G Y'0  
   break; $2L6:&.P,  
  } L/V^#$  
 } });Rjg  
 return bAdded;  7-!n-  
} DQm%=ON7  
Zo yO[#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) So'.QWzX  
{ }$4z$&  
 BOOL bRemoved=FALSE; +8T^q,  
 for(int index=0;index<MAX_KEY;index++){ v|o{AL:ei  
  if(hCallWnd[index]==hWnd){ ~~Ezt*lH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]MosiMJF  
    hCallWnd[index]=NULL; h0@a"DqK  
    HotKey[index]=0; f$ xp74hw3  
    HotKeyMask[index]=0; d6YXITL)\>  
    bRemoved=TRUE; 2_+>a"8Y  
    KeyCount--; |#kY_d)10  
    break; rUj\F9*5#  
   } ]b!n ;{5  
  } -` U |5  
 } EZ]4cd/i  
 return bRemoved; )J}v.8   
} ,_I rE  
<78|~SKAV  
void VerifyWindow() ]f0'YLG  
{ K+F"VW*?  
 for(int i=0;i<MAX_KEY;i++){ _!@:@e)yB{  
  if(hCallWnd!=NULL){ czuIs|_K*  
   if(!IsWindow(hCallWnd)){ [eDrjf3m  
    hCallWnd=NULL; MMs~f*  
    HotKey=0; .4)oZ  
    HotKeyMask=0; !S#3mT-  
    KeyCount--; 4JAz{aw'b  
   } . : Wf>:  
  } j)?M  
 } ehr-o7](  
} *WQ?r&[_'  
gM\>{ihM'  
BOOL CHookApp::InitInstance() pOc2V  
{ 5mD8$% \8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7"!b5(4=  
 hins=AfxGetInstanceHandle(); 'bi;Y1:  
 InitHotkey(); dm4Q'u  
 return CWinApp::InitInstance(); ?K>)bA&l'  
} 2@<_,'  
49~d6fH  
int CHookApp::ExitInstance() H@=oVyn/  
{ ZH_$Q$9  
 VerifyWindow(); Q'/sP 5Pj  
 UnInit(); d +D~NA[M  
 return CWinApp::ExitInstance(); oLT#'42+H  
} L7-BuW}&  
1 :p'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ew~Z/ A   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >v.f H6P,}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P1Hab2%+  
#if _MSC_VER > 1000 wtY)(k a  
#pragma once tQ|c.`)W  
#endif // _MSC_VER > 1000 Z8 #nu  
7~e,"^>T  
class CCaptureDlg : public CDialog @M5+12FYt  
{ Lt't   
 // Construction ^ ` y7JXI:  
 public: CUu Owx6%  
  BOOL bTray; 4 XjwU`  
  BOOL bRegistered; wtTy(j,9  
  BOOL RegisterHotkey(); .h-mFcjy  
  UCHAR cKey; Fv pU]  
  UCHAR cMask; ^l!SIu  
  void DeleteIcon();   3%kUj  
  void AddIcon(); 4>*=q*<V5E  
  UINT nCount; .| 4P :r  
  void SaveBmp(); 4v\HaOk  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "?NDN4l*  
  // Dialog Data s6,~J F^  
  //{{AFX_DATA(CCaptureDlg) Wigt TAh4  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]y_ :+SHc  
  CComboBox m_Key; Z-PB CU  
  BOOL m_bControl; '~D4%WKT  
  BOOL m_bAlt; $0_K&_5w~  
  BOOL m_bShift; JU?;Kq9R  
  CString m_Path; .9nqJ7]  
  CString m_Number; yE8D^M|g  
  //}}AFX_DATA u}@N Qeg  
  // ClassWizard generated virtual function overrides ba|xf@=&  
  //{{AFX_VIRTUAL(CCaptureDlg) K81X32Lm'  
 public: d`^3fr'.4A  
  virtual BOOL PreTranslateMessage(MSG* pMsg); o08WC'bX  
 protected: |g&V? lI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Lv%3 jj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {N4 'g_  
  //}}AFX_VIRTUAL 4z0gyCAC A  
  // Implementation .l1x~(  
 protected: Nn LK!Q  
  HICON m_hIcon; [ohLG_9  
  // Generated message map functions FS1\`#Bm)  
  //{{AFX_MSG(CCaptureDlg) |>;PV4])(  
  virtual BOOL OnInitDialog(); ,*|Q=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9 C[~*,qx  
  afx_msg void OnPaint(); Nk7y2[  
  afx_msg HCURSOR OnQueryDragIcon(); I%5vI}  
  virtual void OnCancel(); t*IePz]/  
  afx_msg void OnAbout(); Lh[0B.g<  
  afx_msg void OnBrowse(); u cpU $+  
  afx_msg void OnChange(); w2 Y%yjCV  
 //}}AFX_MSG DBAyc#&#  
 DECLARE_MESSAGE_MAP() U@OdQAX  
}; QLY;@-jF$  
#endif Msqqjhoy  
?Y4 +3`\x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x%viCkq  
#include "stdafx.h" xt^1,V4Ei~  
#include "Capture.h" L7rgkxI7k*  
#include "CaptureDlg.h" nwFBuP<LR  
#include <windowsx.h> MQoA\  
#pragma comment(lib,"hook.lib") duG!QS:  
#ifdef _DEBUG qp})4XTv  
#define new DEBUG_NEW &-=~8  
#undef THIS_FILE jIs>>  
static char THIS_FILE[] = __FILE__; hxoajexU  
#endif pP| @Z{7d`  
#define IDM_SHELL WM_USER+1 _E C7r>V&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z!g$#hmL>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); mw"FQ?bJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iB)\* )  
class CAboutDlg : public CDialog ]? y~;-^  
{ vbid>$%  
 public: XoKgs,y4  
  CAboutDlg(); qO>UN[Y  
  // Dialog Data Y#F.{ i  
  //{{AFX_DATA(CAboutDlg) ;M~,S^U  
  enum { IDD = IDD_ABOUTBOX }; cY5&1Shb~  
  //}}AFX_DATA 05wkUo:9  
  // ClassWizard generated virtual function overrides v@\S$qU2  
  //{{AFX_VIRTUAL(CAboutDlg) ;J W ]b]  
 protected: Hu|Tj<S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vb>F)X?b_  
  //}}AFX_VIRTUAL Ae>+Fcv  
  // Implementation o +$v0vg%T  
 protected: )g@+ MR  
  //{{AFX_MSG(CAboutDlg) NY.Cr.}  
  //}}AFX_MSG IBa0O|*6  
  DECLARE_MESSAGE_MAP() MLd; UHU  
}; \IL)~5d  
|4@cX<d.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _Raf7W  
{ U"Gx Xrl  
 //{{AFX_DATA_INIT(CAboutDlg) p<L7qwOii  
 //}}AFX_DATA_INIT B?j t?  
} /|v4]t-  
H:DR?'yW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [%K6-\S  
{ x1 |/  
 CDialog::DoDataExchange(pDX); 9y!0WZE{e  
 //{{AFX_DATA_MAP(CAboutDlg) s@Q7F{z  
 //}}AFX_DATA_MAP p"0#G&-  
} 1 uU$V =  
$ar^U  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) m,HE4`g  
 //{{AFX_MSG_MAP(CAboutDlg) ai<qK3!O  
 // No message handlers HYdM1s6vo  
 //}}AFX_MSG_MAP sQgz}0_= )  
END_MESSAGE_MAP() zH1 ;h  
kK75(x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }d. X2?  
: CDialog(CCaptureDlg::IDD, pParent) YoKE=ln7  
{ i9ySD  
 //{{AFX_DATA_INIT(CCaptureDlg) B#g~c<4<  
  m_bControl = FALSE; $z$^ yjL  
  m_bAlt = FALSE; $@Vn+| Ix  
  m_bShift = FALSE; cSPQ NYU:  
  m_Path = _T("c:\\"); FJ0I&FyWs  
  m_Number = _T("0 picture captured."); Jr5S8 c|"  
  nCount=0; 9QU\J0c/  
  bRegistered=FALSE; : #a  
  bTray=FALSE; ZxtO.U2  
 //}}AFX_DATA_INIT YrL(4 Nt8  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 UBL{3s^"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z1fY' f  
} ()aCE^C  
U`6|K$@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O:0{vu9AQ  
{ bSe\d~{  
 CDialog::DoDataExchange(pDX); q(n"r0)=  
 //{{AFX_DATA_MAP(CCaptureDlg) `NtW+v  
  DDX_Control(pDX, IDC_KEY, m_Key); vEI{AmogRx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); c0o]O[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); s*rR> D:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  dfFw6R  
  DDX_Text(pDX, IDC_PATH, m_Path); c'Z=uL<Rm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WWp MuB_G  
 //}}AFX_DATA_MAP %_|KiW  
} Hhtl~2t!0  
=2$ ( tXL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C_J@:HlJ  
//{{AFX_MSG_MAP(CCaptureDlg) uX-^ 9t  
 ON_WM_SYSCOMMAND() =d Q[I6  
 ON_WM_PAINT() uGZGI;9f4  
 ON_WM_QUERYDRAGICON() |3~m8v2-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V0^{Ss1M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) IR${a)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) u[**,.Ecg  
//}}AFX_MSG_MAP Cf(WO-F^  
END_MESSAGE_MAP() Phi5;U!  
QD7KE6KP'  
BOOL CCaptureDlg::OnInitDialog() =DdPwr 0Op  
{ Rrh6-]A  
 CDialog::OnInitDialog(); %np(z&@wi  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "s|P,*Xf  
 ASSERT(IDM_ABOUTBOX < 0xF000); K+)3 LR^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6,5h4[eF*  
 if (pSysMenu != NULL) o}Grb/LJ  
 { rXW.F'=K6  
  CString strAboutMenu; 4w+AOWjd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); S TWH2_`  
  if (!strAboutMenu.IsEmpty()) kl]V_ 7[  
  { ,ciX *F"  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?t%{2a<X  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); s~{rC{9X  
  } !L.R"8!  
 } )B]s.w  
 SetIcon(m_hIcon, TRUE); // Set big icon j4;^5 Dy^  
 SetIcon(m_hIcon, FALSE); // Set small icon "73*0'm  
 m_Key.SetCurSel(0); jSpj6:@B  
 RegisterHotkey(); l,J>[Q`<  
 CMenu* pMenu=GetSystemMenu(FALSE); s?HK2b^;D  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =0?5hxMd  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lo!pslqsn  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }Nr6oUn  
 return TRUE; // return TRUE unless you set the focus to a control XncX2E4E  
}  Z}t;:yhR  
MiZ<v/L2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ow'G&<0b  
{ HrE,K\^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) RNc:qV<H  
 { 7G+!9^  
  CAboutDlg dlgAbout; S*<Jy(:n  
  dlgAbout.DoModal(); ou-#+Sdd  
 } ,marNG  
 else :,l16{^  
 { VEy]vr}  
  CDialog::OnSysCommand(nID, lParam); sgO au\E  
 } E#_/#J]UQn  
} XQ=%a5w  
bit|L7*14  
void CCaptureDlg::OnPaint() <-.@,HQ+  
{ sl-wNIQ  
 if (IsIconic()) ]r#b:W\  
 { D9TjjA|zS  
  CPaintDC dc(this); // device context for painting q;#AlquY@  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;SE*En  
  // Center icon in client rectangle GZi`jp  
  int cxIcon = GetSystemMetrics(SM_CXICON); gM&O dT+i  
  int cyIcon = GetSystemMetrics(SM_CYICON); <n,QSy#  
  CRect rect; IoL P*D  
  GetClientRect(&rect); *f 7rLM*  
  int x = (rect.Width() - cxIcon + 1) / 2; 5Xr})%L  
  int y = (rect.Height() - cyIcon + 1) / 2; 6/ 5c|  
  // Draw the icon 8XYxyOl  
  dc.DrawIcon(x, y, m_hIcon); "*HM8\  
 } :|9vMM^$  
 else ;"cQ)=s9Y  
 { @Y`Z3LiR$  
  CDialog::OnPaint();  p0W<K  
 } v' t'{g%  
} ;.AMP$o`(Y  
8Ygf@*9L4  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3UXZ|!-  
{ g$NUu  
 return (HCURSOR) m_hIcon; x:0swZ5Z  
} Gx$m"Jeq\  
d;<'28A  
void CCaptureDlg::OnCancel() F5X9)9S  
{ : j kO  
 if(bTray) G>"n6v'^d  
  DeleteIcon(); Pl=)eq YY  
  CDialog::OnCancel(); 1Du5Z9AM  
} "Bwz Fh  
4!Radl3`  
void CCaptureDlg::OnAbout() &Z>??|f  
{ \)5mO 8w  
 CAboutDlg dlg; <pV8 +V)  
 dlg.DoModal(); ~~|Iw=:  
} O [= L#wi  
,vLQx\m{  
void CCaptureDlg::OnBrowse() qqo#H O  
{  omg#[  
 CString str; mKu,7nMvF  
 BROWSEINFO bi; -BP10-V  
 char name[MAX_PATH]; )C"ixZ>2xQ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $1B?@~&  
 bi.hwndOwner=GetSafeHwnd(); 0R? @JC  
 bi.pszDisplayName=name; h!uyTgq  
 bi.lpszTitle="Select folder"; Y=|p}>.}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %\HE1d5;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ilQ}{p6I  
 if(idl==NULL) g%Tokl  
  return; S`YT"|~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  I!?Xq  
 str.ReleaseBuffer(); wbJBGT{sm  
 m_Path=str; `Y.~eE  
 if(str.GetAt(str.GetLength()-1)!='\\')  &lU\9  
  m_Path+="\\"; q#AIN`H  
 UpdateData(FALSE); 9]Ue%%vM  
} h STcL:b   
kJl^,q  
void CCaptureDlg::SaveBmp() ]VQd *~ -  
{ iS)-25M'  
 CDC dc; s<"|'~<n  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); i`e[Vwe2x@  
 CBitmap bm; ROn@tW  
 int Width=GetSystemMetrics(SM_CXSCREEN); UapU:>!"`  
 int Height=GetSystemMetrics(SM_CYSCREEN); { i6L/U.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); } r(b:}DN  
 CDC tdc; ;^bfLSWm{  
 tdc.CreateCompatibleDC(&dc); [ KgO:},c  
 CBitmap*pOld=tdc.SelectObject(&bm); Z[w}PN,xV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ip<VRC5`5  
 tdc.SelectObject(pOld); Wk7E&?-:6  
 BITMAP btm; hDTC~~J/  
 bm.GetBitmap(&btm); .]h/M,xg  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; lCUYE"o  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  !AJkd.  
 BITMAPINFOHEADER bih; f6K.F  
 bih.biBitCount=btm.bmBitsPixel; ~5N oR  
 bih.biClrImportant=0; y akRKiz\  
 bih.biClrUsed=0; 6QA`u*  
 bih.biCompression=0; T0dD:sN  
 bih.biHeight=btm.bmHeight; ~n@rX=Y)]0  
 bih.biPlanes=1; a(6h`GHo  
 bih.biSize=sizeof(BITMAPINFOHEADER); @*<0:Q|m  
 bih.biSizeImage=size; D|Q7dIZm  
 bih.biWidth=btm.bmWidth; (_4DZMf  
 bih.biXPelsPerMeter=0; C{m%]jKH  
 bih.biYPelsPerMeter=0; [u!n=ev  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); vE^tdzAG  
 static int filecount=0; Cp/f18zO  
 CString name; 2? yo  
 name.Format("pict%04d.bmp",filecount++); Z@dVK`nD  
 name=m_Path+name; \8$~ i  
 BITMAPFILEHEADER bfh; ;PC!  
 bfh.bfReserved1=bfh.bfReserved2=0; "P#1=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); g/f6N z  
 bfh.bfSize=54+size; XxMZU(5  
 bfh.bfOffBits=54; =K0%bI  
 CFile bf; gIz!~I_U  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V'{\g|)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UA*VqK)Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,DE>:ARZ  
  bf.WriteHuge(lpData,size); Jn=;gtD- *  
  bf.Close(); 2<B'PR-??y  
  nCount++; JMt*GFd  
 } OS; T;  
 GlobalFreePtr(lpData); @ :Zk,   
 if(nCount==1) P~{8L.w!>W  
  m_Number.Format("%d picture captured.",nCount); sw}O g`U  
 else u$^tRz9  
  m_Number.Format("%d pictures captured.",nCount); WN=0s  
  UpdateData(FALSE); 0D2I)E72o  
} Dh8'og)7  
siI%6Gn;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `WXlq#:K  
{ h-1?c\Qq:  
 if(pMsg -> message == WM_KEYDOWN) +Mijio  
 { ou-UR5  
  if(pMsg -> wParam == VK_ESCAPE) l90"1I A  
   return TRUE; 2rT^OGw6  
  if(pMsg -> wParam == VK_RETURN) wjl)yo$z  
   return TRUE; Q*T 'tkp  
 } ,\v'%,:C  
 return CDialog::PreTranslateMessage(pMsg); D {Ol8:  
} gep#o$P  
R6(:l; W  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hm73Zy  
{ t}_ #N'`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *'{-!Y  
  SaveBmp(); 3<W%z]k@M  
  return FALSE; :6lvX$  
}  iiQn/%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -JgNujt#9  
 CMenu pop; M]r?m@)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); NCkI[d]B@  
 CMenu*pMenu=pop.GetSubMenu(0); ISNL='%  
 pMenu->SetDefaultItem(ID_EXITICON); wxvi)|)  
 CPoint pt; mF\!~ag|  
 GetCursorPos(&pt); a)ry}E =f  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4{F1GW  
 if(id==ID_EXITICON) Kb(11$U  
  DeleteIcon(); edo)W mn  
 else if(id==ID_EXIT) *KvD$(ny  
  OnCancel(); c$ZV vu  
 return FALSE; !-7n69:G  
} i WD|F-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Z,#H\1v3lB  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) cp(qaa  
 AddIcon(); \PE;R.v_:  
 return res; HCN/|z1Xq  
} *z VN6wG{  
qMJJBl  
void CCaptureDlg::AddIcon() 6E}9uwQ  
{ wv3,% lN  
 NOTIFYICONDATA data; QKj0~ia 5  
 data.cbSize=sizeof(NOTIFYICONDATA); HGGq;Nbm  
 CString tip; `RnWh9  
 tip.LoadString(IDS_ICONTIP); Gf\h7)T\  
 data.hIcon=GetIcon(0); A! bG2{r  
 data.hWnd=GetSafeHwnd(); S/5QK(XLC)  
 strcpy(data.szTip,tip); 0h@FHw2d  
 data.uCallbackMessage=IDM_SHELL; *[]E 5U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X-HE9PT.  
 data.uID=98; k B>F(^  
 Shell_NotifyIcon(NIM_ADD,&data); AChz}N$C  
 ShowWindow(SW_HIDE); |2q3spd  
 bTray=TRUE; A0)^I:&  
} f zo'9  
d>hv-n D  
void CCaptureDlg::DeleteIcon() (*$bTI/~  
{ jCJcVO>OZ  
 NOTIFYICONDATA data; DRQx5fgL  
 data.cbSize=sizeof(NOTIFYICONDATA); J |q(HpB  
 data.hWnd=GetSafeHwnd(); mtv8Bm=<  
 data.uID=98; @[3c1B6K  
 Shell_NotifyIcon(NIM_DELETE,&data); S\TXx79PhC  
 ShowWindow(SW_SHOW); *vaYI3{qN  
 SetForegroundWindow(); Kn~Rck| ]  
 ShowWindow(SW_SHOWNORMAL); Zl5'%b$&  
 bTray=FALSE; @zg}x0]  
} hN'])[+V  
Tsg9,/vXM  
void CCaptureDlg::OnChange() )SmnLvL  
{ ^OY]Y+S`Ox  
 RegisterHotkey(); LQR2T5S/Q,  
} 4qie&:4j  
F]3Y,{/V  
BOOL CCaptureDlg::RegisterHotkey() s7Agr!>f  
{ B`}um;T#~,  
 UpdateData(); P'Rw/c o  
 UCHAR mask=0; NGc~%0n  
 UCHAR key=0; v(2N@s <%  
 if(m_bControl) J3_aHI  
  mask|=4; u;_~{VJ-  
 if(m_bAlt) uNzc,OH  
  mask|=2; p:4jY|q  
 if(m_bShift) h+ [6i{  
  mask|=1; Ym6d'd<9(  
  key=Key_Table[m_Key.GetCurSel()]; {.:$F3T  
 if(bRegistered){ $6"(t=%{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /d3Jd .l!  
  bRegistered=FALSE; OT{"C"%5t  
 } *1dDs^D#|  
 cMask=mask; ~sk p}g]  
 cKey=key; v=N?(6T  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); GDxv2^4  
 return bRegistered; A8Ju+  
} glMHT,  
Ha@; Sz<R  
  四、小结 |u&cN-}C d  
P"w\hF  
  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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