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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: abK/!m[q  
  g_q{3PW.  
  一、实现方法 t]m#k%)  
\0:l9;^4  
  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 |GWYw'%  
`aUA_"f  
#pragma data_seg("shareddata") @B[V'|  
HHOOK hHook =NULL; //钩子句柄 59)PJ0E  
UINT nHookCount =0; //挂接的程序数目 g,1\Gj%y  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )PwDP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 f&,.h"bS  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [m4<j  
static int KeyCount =0; ':fVb3A[*d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  [g/g(RL  
#pragma data_seg() H<q:+  
> vahj,CZZ  
  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"4:aKF>  
$V+ze*ra  
  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: r9QNE>UG  
E;X'.7[c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 's9)\LS>p  
cKey,UCHAR cMask) sPhh#VCw{  
{ +F@9AO>LF  
 BOOL bAdded=FALSE; $DQMN  
 for(int index=0;index<MAX_KEY;index++){  g6~uf4;  
  if(hCallWnd[index]==0){ %@IR7v~  
   hCallWnd[index]=hWnd; c~Ha68  
   HotKey[index]=cKey; X-%*`XG'  
   HotKeyMask[index]=cMask; Vw,dHIe(3  
   bAdded=TRUE; *AJW8tIP  
   KeyCount++; ^,rbA>/L  
   break; *v&g>Ni  
  } Z)ObFJMG5  
 } N#UyAm<9  
 return bAdded; D,R/abYZH  
} ){,8}(|  
//删除热键 0>AA-~=-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ed617J  
{ ]v+\v re  
 BOOL bRemoved=FALSE; 9iv!+(ni  
 for(int index=0;index<MAX_KEY;index++){  :${Lm&J  
  if(hCallWnd[index]==hWnd){ 8L&#<Ol  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X2EC+<  
    hCallWnd[index]=NULL; &< ~`?-c  
    HotKey[index]=0; jfI|( P  
    HotKeyMask[index]=0; toP7b  
    bRemoved=TRUE; zIlQqyOQ8  
    KeyCount--; 0R; ;ou  
    break; Gz kf  
   } z,^baU  
  } /|>z7#?m^  
 } |i|>-|`!  
 return bRemoved; P>)qN,a  
} p{88v3b6  
khyV uWN  
y0z}[hZ  
  DLL中的钩子函数如下: jPFA\$To  
U/TF,JUI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yJ?4B?p(  
{ h>fY'r)DAx  
 BOOL bProcessed=FALSE; T]0qd^\4w  
 if(HC_ACTION==nCode) Xp%JPI {  
 { RCsd  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +H+OYQ>^  
   switch(wParam) 9/0<Z_b2  
   {  [5,#p$R  
    case VK_MENU: $L3UDX+F  
     MaskBits&=~ALTBIT; k/*r2 C  
     break; g<tr |n  
    case VK_CONTROL: Y>IEB,w  
     MaskBits&=~CTRLBIT; jy6% CSWQ  
     break; -[G+*3Y{7  
    case VK_SHIFT: eM{+R^8  
     MaskBits&=~SHIFTBIT; N 0`)WLW  
     break; ':J[KWuV  
    default: //judge the key and send message V+DN<F-  
     break; $My%7S/3  
   } X62GEqff  
   for(int index=0;index<MAX_KEY;index++){ g }5lGz4  
    if(hCallWnd[index]==NULL) T,5]EHea  
     continue; N5o jXX!l%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0>>tdd7  
    { ](B+ilr   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t}]=5)9<  
     bProcessed=TRUE; '(~+ \  
    } EQMn'>  
   } "*<9)vQ6|  
  } s<aJ pi{n4  
  else if((lParam&0xc000ffff)==1){ //有键按下 LKTIwb>  
   switch(wParam) ss.wX~I  
   { s )\%%CM  
    case VK_MENU: xa??OT`(  
     MaskBits|=ALTBIT; H71LJfH  
     break; K oo%mr   
    case VK_CONTROL: y&UcTE2;%(  
     MaskBits|=CTRLBIT; N<9C V!_  
     break; ([^1gG+>J  
    case VK_SHIFT: ZI}7#K<9X  
     MaskBits|=SHIFTBIT; e'p'{]r<w  
     break; (xy/:i".V  
    default: //judge the key and send message 'tklz*  
     break; ,d$V-~2,  
   } F0qGkMs|f  
   for(int index=0;index<MAX_KEY;index++){ 5hg:@i',  
    if(hCallWnd[index]==NULL) ;3 O0O  
     continue; 1o V\QK&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g>cp;co9g  
    { =:uK$>[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !T!U@e=u  
     bProcessed=TRUE; MQ7N8@!t  
    } ,eW K~ pa  
   } lmf vT}$B  
  } GU([A@;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zT 9"B  
   for(int index=0;index<MAX_KEY;index++){ 7'LKyy !"3  
    if(hCallWnd[index]==NULL) ">@]{e*  
     continue; /0A9d-Qd<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]MKW5Kq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VG_ PBG(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AAb3Jf`UW  
   } fp^{612O?  
  } &gR)Y3  
 } ,( u- x!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )[oegfnn-  
} Yw7txp`i  
'1'De^%6W  
  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: Y23- Im  
oc7&iL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aJdd2,e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H,u{zU')  
?0*,x)t  
  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: &{-r 5d23  
m<}>'D T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6#hDj_(,  
{ IOhJL'r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) UuPXo66F ]  
 { L 7VDZCV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $KHw=<:)/  
  SaveBmp(); 7@oM?r7td  
  return FALSE; >"5 f B  
 } W|'7)ph  
 …… //其它处理及默认处理 Ve)P/Zz}^  
} GJS3O;2*  
D~P3~^  
hg4d]R,  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 tpPP5C{  
RUco3fZ   
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 zZp0g^;.?  
Di) %vU  
  二、编程步骤 4&N#d;ErC  
Pw+PBIGn4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; JbX"K< nQ  
Mu: y9o95  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }:+SA  
QP>tu1B|  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; *hWpJEV  
*@)0TL( 03  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /o L& <e  
pW5ch"HE  
  5、 添加代码,编译运行程序。 #!?jxfsFa  
H?oBax:  
三、程序代码 B! +rO~  
h @AKfE!\~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )SU\s+"M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) hQ7-m.UZw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4*Uzomb?q  
#if _MSC_VER > 1000 fab. %$  
#pragma once w}|XSJ!  
#endif // _MSC_VER > 1000 HKp|I%b]J  
#ifndef __AFXWIN_H__ qtrN=c3x  
#error include 'stdafx.h' before including this file for PCH yM}~]aQ y  
#endif X<8?>#  
#include "resource.h" // main symbols `)~]3zmG  
class CHookApp : public CWinApp p>oC.[:4a  
{ #ME!G/  
 public: T3wQRn  
  CHookApp(); \3"jW1Wb  
  // Overrides NTWy1  
  // ClassWizard generated virtual function overrides aC90IJ8^  
  //{{AFX_VIRTUAL(CHookApp) P K+rr.k]  
 public: 0Wkk$0h9  
  virtual BOOL InitInstance(); (1IYOlG4  
  virtual int ExitInstance(); #)r^ZA&E  
  //}}AFX_VIRTUAL Q HU|aC{r  
  //{{AFX_MSG(CHookApp) \<ko)I#%  
  // NOTE - the ClassWizard will add and remove member functions here. p~'iK4[&6  
  // DO NOT EDIT what you see in these blocks of generated code ! >V%lA3  
  //}}AFX_MSG 6;:z?Q  
  DECLARE_MESSAGE_MAP() =e)t,YVm  
}; pq"Z,9,F%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zEVQ[y6BcM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zsM2R"[X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %8O1sF  
BOOL InitHotkey(); PfR|\{(  
BOOL UnInit(); 2t7P| b~V1  
#endif g ?.y7!m  
]SC|%B_*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. LUs)"ZAi|  
#include "stdafx.h" /9pN.E  
#include "hook.h" =fRC$  
#include <windowsx.h> ObPXVqG"?  
#ifdef _DEBUG fZ aTckbE  
#define new DEBUG_NEW ~U r  
#undef THIS_FILE k=W~ot &  
static char THIS_FILE[] = __FILE__; )-\C{>  
#endif ]-j.\+(*  
#define MAX_KEY 100 ,B~5;/ |  
#define CTRLBIT 0x04 57wHo[CJ  
#define ALTBIT 0x02 4aP 96  
#define SHIFTBIT 0x01 $fCKK&Wy  
#pragma data_seg("shareddata") *z'v  
HHOOK hHook =NULL; WKAG)4  
UINT nHookCount =0; $PstEL  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?:tk8Kgf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gc\/A\F<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey DFkDlx  
static int KeyCount =0; f\;w(_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z=9<esx  
#pragma data_seg() nR]*RIp5  
HINSTANCE hins; wrQ0 2?  
void VerifyWindow(); 1oc@]0n  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) J@o_-\@  
//{{AFX_MSG_MAP(CHookApp) \ 5.nr*5  
// NOTE - the ClassWizard will add and remove mapping macros here. )n6,uTlOw  
// DO NOT EDIT what you see in these blocks of generated code! h2-v.Tjf  
//}}AFX_MSG_MAP }_Ci3|G>%D  
END_MESSAGE_MAP() 6:~<L!`&  
Sse%~:FL  
CHookApp::CHookApp() ExhK\J  
{ g`z;:ao  
 // TODO: add construction code here, E~@&&d U8  
 // Place all significant initialization in InitInstance 2qdc$I&$  
} sYhHh$mwA  
~GE|,Np  
CHookApp theApp; Gf +>Aj U'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4bCA"QM[[  
{ p/yz`m T'w  
 BOOL bProcessed=FALSE; w@"Zjbs`  
 if(HC_ACTION==nCode) /Y=_EOS  
 { s3Wjhw/  
  if((lParam&0xc0000000)==0xc0000000){// Key up QQ`tSYgex  
   switch(wParam) m@Dra2Cv'@  
   { o~<jayqU  
    case VK_MENU: u6 QW*8b4  
     MaskBits&=~ALTBIT; 4.Q[Tu  
     break; >V?W_oM)  
    case VK_CONTROL: ^F'~|zc"C  
     MaskBits&=~CTRLBIT; /Xq|S O  
     break; IgjPy5k  
    case VK_SHIFT: 1M.#7;#B3  
     MaskBits&=~SHIFTBIT; 25f[s.pv8  
     break; &q&~&j'[  
    default: //judge the key and send message $Zr \$z2  
     break; ?S;z!) H)P  
   } w~_ycY.e  
   for(int index=0;index<MAX_KEY;index++){ 2 OV$M~  
    if(hCallWnd[index]==NULL) * V7bALY  
     continue; ^&\pY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qnHjwMi  
    { ]x).C[^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ce;$)Ff\  
     bProcessed=TRUE; [p' A?-  
    } oxBTm|j7  
   } a"i(.(9$J  
  } 9@ 4]t6h[  
  else if((lParam&0xc000ffff)==1){ //Key down CA1Jjm=  
   switch(wParam) S}fQis  
   { !?R#e`}  
    case VK_MENU: 4X",:B}  
     MaskBits|=ALTBIT; ])G| U A.  
     break; (t){o> l  
    case VK_CONTROL: # > I_  
     MaskBits|=CTRLBIT; ]cv/dY#  
     break; nrA 4N1  
    case VK_SHIFT: :f:&B8  
     MaskBits|=SHIFTBIT; lI%RdA[  
     break; M3elog:M  
    default: //judge the key and send message fK~8h  
     break; yZ!~m3Q  
   } ,{\Ae"{6  
   for(int index=0;index<MAX_KEY;index++) aS[y\9(**  
   { '%ByFZ zi  
    if(hCallWnd[index]==NULL) +1I 7K|M  
     continue; _xH<R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QOgGL1)7-  
    { r@zs4N0WP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3-E-\5I  
     bProcessed=TRUE; ~+d{:WY  
    } ;jaugKf  
   } Tay$::V  
  } ~9OZRt[&  
  if(!bProcessed){ >Tjl?CS  
   for(int index=0;index<MAX_KEY;index++){ HY eCq9S  
    if(hCallWnd[index]==NULL) } xA@3RT  
     continue; O8A(OfX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (, ik:j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V;g) P  
   } -+u}u=z%  
  } $9j>oUG  
 } |Xm$O1Wa  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?(U;T!n  
} JU;`c>8=)  
n!AW9]  
BOOL InitHotkey() p^}`^>OL  
{ $UdBZT-  
 if(hHook!=NULL){ Tt9cX}&&  
  nHookCount++; wd32q7lGo1  
  return TRUE; j^;P=L0=  
 } N@O e[X8  
 else ~NPhVlT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6`iYIXnz  
  if(hHook!=NULL) cHVJ7yAZI  
   nHookCount++; `k*;%}X\  
  return (hHook!=NULL); qdy(C^(fa  
} u,nn\>Y  
BOOL UnInit() ES!e/l  
{ Xn?.Od(  
 if(nHookCount>1){ "wcw`TsK  
  nHookCount--;  3s| :7  
  return TRUE; D"-Wo}"8O'  
 } {chZ&8)f  
 BOOL unhooked = UnhookWindowsHookEx(hHook); d>mT+{3  
 if(unhooked==TRUE){ =-~))!(  
  nHookCount=0; {}8C/4iP  
  hHook=NULL; q5S_B]|  
 } { `Z~T&}~T  
 return unhooked; mR1b.$  
} )A%* l9\nG  
%WKBd \O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y$bY 8L  
{ (J.Z+s$:2  
 BOOL bAdded=FALSE; pZK 1G  
 for(int index=0;index<MAX_KEY;index++){  [B`4I  
  if(hCallWnd[index]==0){ YlUh|sK7m  
   hCallWnd[index]=hWnd; !q,7@W3i  
   HotKey[index]=cKey; j24DL+  
   HotKeyMask[index]=cMask; LLT6*up$  
   bAdded=TRUE; 9_d# F'#F  
   KeyCount++; U,p'<rmS  
   break; [0105l5  
  } ~4Gc~"  
 } SPRTJdaC9  
 return bAdded; z;P#  
} J)y g<*/3  
2}XRqa.|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v0!|TI3s  
{ !hM`Oe`S  
 BOOL bRemoved=FALSE; ;-JFb$m  
 for(int index=0;index<MAX_KEY;index++){ !ht2*8$lQ  
  if(hCallWnd[index]==hWnd){ E:M,nSc)53  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4eB oR%2o  
    hCallWnd[index]=NULL; 6it [i@*"  
    HotKey[index]=0; u?fM.=/N  
    HotKeyMask[index]=0; Dq<DW2It>  
    bRemoved=TRUE; ?H,f|nc  
    KeyCount--; 9G2rVk  
    break; o?m1  
   } />}zB![(K  
  } +jZa A/  
 } ;,6C&|n]w  
 return bRemoved; -0 <vmU  
} sbX7VfAR`  
j;b>~_ U%  
void VerifyWindow() ~E((n  
{ _aOs8#(X  
 for(int i=0;i<MAX_KEY;i++){ ^'`(E_2u  
  if(hCallWnd!=NULL){ LxGD=b  
   if(!IsWindow(hCallWnd)){ kvbW^pl  
    hCallWnd=NULL; T [xIn+w  
    HotKey=0; @VW1^{.do^  
    HotKeyMask=0; AZ4?N.X?  
    KeyCount--; OI6Mx$  
   } RQ[/s lg  
  } iX{2U lF7  
 } &y1iLk h^  
} 0&fO)de96  
I}o} # OJ  
BOOL CHookApp::InitInstance() L~)8Q(f  
{ `Mt|+iT$p  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); YLTg(*  
 hins=AfxGetInstanceHandle(); T%& vq6  
 InitHotkey(); zj] g^c;  
 return CWinApp::InitInstance(); w' J`$=  
} p&V64L:V  
4G' E< ab  
int CHookApp::ExitInstance() [jlum>K  
{ %X.g+uu  
 VerifyWindow(); {wA8!5Gu  
 UnInit(); k7rg:P  
 return CWinApp::ExitInstance(); ,D*bLXWh  
} <yX  u!  
wMN{9Ce3j  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &v*4AZ['  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) w9<'0wcs  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ J^7M0A4K  
#if _MSC_VER > 1000 ~!2fUewEu  
#pragma once ;SjNZi)4d  
#endif // _MSC_VER > 1000 0iZeU:FE  
,G46i)E\  
class CCaptureDlg : public CDialog aXqig&:  
{ BF2U$-k4  
 // Construction 'Ca;gi !U  
 public: ;b=diZE  
  BOOL bTray; R= mT J'y  
  BOOL bRegistered; ^o _J0 ]m  
  BOOL RegisterHotkey(); ^78N25RU(  
  UCHAR cKey; 5EVypw?]x  
  UCHAR cMask; hZ>m:es  
  void DeleteIcon(); 5NN;Fw+  
  void AddIcon(); #yR&|*@  
  UINT nCount; 0\Jeyb2dl  
  void SaveBmp(); l#T %N@X  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor psmDGSm,&  
  // Dialog Data p&Qm[!  
  //{{AFX_DATA(CCaptureDlg) `5h^!="  
  enum { IDD = IDD_CAPTURE_DIALOG }; HH7WMYoKY  
  CComboBox m_Key; WxO+cB+?  
  BOOL m_bControl; @w.DN)GPo  
  BOOL m_bAlt; L>1y[ Q  
  BOOL m_bShift; 56c[$ q  
  CString m_Path; 5vR])T/S0  
  CString m_Number; +:ms`Sr>  
  //}}AFX_DATA w.J$(o(/  
  // ClassWizard generated virtual function overrides L)\<7  
  //{{AFX_VIRTUAL(CCaptureDlg) 'Z.C&6_  
 public: F5YoEWS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?yj g\S?L  
 protected: !LpjTMYs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H.>EO&#|p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vxk0@k_  
  //}}AFX_VIRTUAL # }}6JM  
  // Implementation ulW>8bW&  
 protected: H c>yZ:c;  
  HICON m_hIcon; |:#Ug  
  // Generated message map functions GXD<X_[  
  //{{AFX_MSG(CCaptureDlg) 9)S3{i6w  
  virtual BOOL OnInitDialog(); zb4@U=?w}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <+q`Dk  
  afx_msg void OnPaint(); _ {#K  
  afx_msg HCURSOR OnQueryDragIcon(); J!~kqNI  
  virtual void OnCancel(); `^^t#sT   
  afx_msg void OnAbout(); 2(~Zl\  
  afx_msg void OnBrowse(); ..nVViZ  
  afx_msg void OnChange(); wy:Gy9\  
 //}}AFX_MSG '-N 5F  
 DECLARE_MESSAGE_MAP() 3o>JJJ=]  
}; ^W@8KB  
#endif ;P juO  
-eh .Tk  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file WFk%nO/  
#include "stdafx.h" %vZHHBylu  
#include "Capture.h" -?1R l:rM  
#include "CaptureDlg.h" b3[!1i  
#include <windowsx.h> 6E1~dK0t  
#pragma comment(lib,"hook.lib") T _UJ?W  
#ifdef _DEBUG pi#a!Quf\  
#define new DEBUG_NEW u0=&_Q(=  
#undef THIS_FILE 5HHf3E [  
static char THIS_FILE[] = __FILE__; P=<lY},  
#endif w[ 3a^  
#define IDM_SHELL WM_USER+1 t&w.Wc X)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m(9I+`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /E\04Bs  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (*6 .-Xn  
class CAboutDlg : public CDialog 2-Q5l*  
{ zd$?2y8  
 public: Hu6Qr  
  CAboutDlg(); . IY@Q  
  // Dialog Data i g7|kl  
  //{{AFX_DATA(CAboutDlg) E`qX|n  
  enum { IDD = IDD_ABOUTBOX }; gSwHPm%zn  
  //}}AFX_DATA (91ts$jH  
  // ClassWizard generated virtual function overrides f2o6GC_  
  //{{AFX_VIRTUAL(CAboutDlg) Y7q Q` |  
 protected: lo6upir ZX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u]O}Ub`  
  //}}AFX_VIRTUAL GKF!GbGR@  
  // Implementation 8O{V#aop  
 protected: 9__Q-J  
  //{{AFX_MSG(CAboutDlg) p8-$MF]] 6  
  //}}AFX_MSG 3 i>NKS  
  DECLARE_MESSAGE_MAP() eE .wnn  
}; <=6F=u3PtU  
1oiSmW\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) M,ybj5:6  
{ :XAyMK7   
 //{{AFX_DATA_INIT(CAboutDlg) yN`&oya  
 //}}AFX_DATA_INIT t$VRNZ`dy  
} "0 %f R"  
8|\ -(:v  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VCnf`wZB"  
{ Zon7G6s9`  
 CDialog::DoDataExchange(pDX); <zTz/Hk`  
 //{{AFX_DATA_MAP(CAboutDlg) =a=:+q g  
 //}}AFX_DATA_MAP nr&|  
} wexX|B^u  
[Rq|;p  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >)*d/^  
 //{{AFX_MSG_MAP(CAboutDlg)  gsi2  
 // No message handlers KTmwkZcfYD  
 //}}AFX_MSG_MAP q)C Xu  
END_MESSAGE_MAP() zx:;0Z:S6>  
6+ptL-Zt<  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c'VCCXe  
: CDialog(CCaptureDlg::IDD, pParent) $>_`.*I/  
{ 9mXmghoCO  
 //{{AFX_DATA_INIT(CCaptureDlg) vyWx{ @  
  m_bControl = FALSE; jz;{,F  
  m_bAlt = FALSE; FwB xag:u  
  m_bShift = FALSE; <v_Wh@m  
  m_Path = _T("c:\\"); }#E]efjs  
  m_Number = _T("0 picture captured."); A-L)2.M  
  nCount=0; | ~>7_:  
  bRegistered=FALSE; lsj9^z7  
  bTray=FALSE; {0fQE@5@  
 //}}AFX_DATA_INIT iI'ib-d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?G!p4u?C  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +T*? ?OW@  
} jp~Tlomp  
Z]2z*XD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nB :iG  
{ <Tbl |9  
 CDialog::DoDataExchange(pDX); p^w)@^f  
 //{{AFX_DATA_MAP(CCaptureDlg) rbv  
  DDX_Control(pDX, IDC_KEY, m_Key); J~`!@!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3rN}iSF^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L_:~{jV  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )`Qr=DIsW  
  DDX_Text(pDX, IDC_PATH, m_Path); /GJL&RMx  
  DDX_Text(pDX, IDC_NUMBER, m_Number); p(4B"[!S  
 //}}AFX_DATA_MAP T.;U~<  
} doX`NbA  
C-,#t5eir  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) tp!eF"v=  
//{{AFX_MSG_MAP(CCaptureDlg) Q (gA:aQ  
 ON_WM_SYSCOMMAND() (NfB+Ue}  
 ON_WM_PAINT() g co;8e_  
 ON_WM_QUERYDRAGICON() "9hD4R  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `e7vSp  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) fn7?g  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #a|r ^%D  
//}}AFX_MSG_MAP o,J8n;"l  
END_MESSAGE_MAP() V^n=@CZT9C  
%)dp a  
BOOL CCaptureDlg::OnInitDialog() |7Z}#eP//  
{ %Rr_fSoV  
 CDialog::OnInitDialog(); !,b&e  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ##mBOdx  
 ASSERT(IDM_ABOUTBOX < 0xF000); $5\sV48f  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h5aPRPUg  
 if (pSysMenu != NULL) gth_Sz5!#  
 { zt|1tU:  
  CString strAboutMenu; =\i%,YY  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #1}%=nAsi  
  if (!strAboutMenu.IsEmpty()) @'hkU$N)  
  { 6Qz=g t%I=  
   pSysMenu->AppendMenu(MF_SEPARATOR); [?,+DY  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +m~3InWq  
  } 3FO-9H  
 } ,|zwY~l t5  
 SetIcon(m_hIcon, TRUE); // Set big icon 4pcIH5)z  
 SetIcon(m_hIcon, FALSE); // Set small icon #-"C_~-MH  
 m_Key.SetCurSel(0); p R`nQM-D  
 RegisterHotkey(); d:]ZFk_*  
 CMenu* pMenu=GetSystemMenu(FALSE); {m,LpI0wG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >8vq`,e  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O\]{6+$fm!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &i`(y>\  
 return TRUE; // return TRUE unless you set the focus to a control wF6a*b@v  
} # X{lV]Z  
[(8s\>T  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <5FGL96  
{ CL(D&8v8~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) C\bJ_vl;'  
 { mB bGj3u;  
  CAboutDlg dlgAbout; mL;oR4{  
  dlgAbout.DoModal(); ,]9p&xu  
 } 4/S3hH  
 else mmNn,>AO!  
 { pA@R,O>zr  
  CDialog::OnSysCommand(nID, lParam); rT4qx2u  
 } g*4^HbVxt  
} *9F{+)A  
awQB0ow'$P  
void CCaptureDlg::OnPaint() 28}L.>5k  
{ 8yZs>Og?  
 if (IsIconic()) zY4y]k8D*  
 { Fy6Lz.baB  
  CPaintDC dc(this); // device context for painting ?g *.7Wc  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _a`/{M|  
  // Center icon in client rectangle <{Rz1CMc  
  int cxIcon = GetSystemMetrics(SM_CXICON); {[{jl G4H  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4~nf~  
  CRect rect; {irl}EeyC  
  GetClientRect(&rect); bi-z%!Z  
  int x = (rect.Width() - cxIcon + 1) / 2; :F"NF  
  int y = (rect.Height() - cyIcon + 1) / 2; 'auYmX  
  // Draw the icon zE}ry!{  
  dc.DrawIcon(x, y, m_hIcon); <]`|HJoy  
 } RO'b)J:j9  
 else d:z7 U  
 { 6s! =de  
  CDialog::OnPaint(); \K Kt& bKL  
 } bNvc@oo  
} ej(< Le\  
uSxldc  
HCURSOR CCaptureDlg::OnQueryDragIcon() \x8'K  
{ Gch3|e  
 return (HCURSOR) m_hIcon; DsHm,dZ  
} x IL]Y7HWM  
 Qk.[#  
void CCaptureDlg::OnCancel() 9!Fg1 h=  
{ I "R<XX  
 if(bTray) d=g,s[FMm  
  DeleteIcon(); !(j<Y0xo:  
  CDialog::OnCancel(); 7$"5qJ{s  
} [ zCKJR  
A- #c1KU!  
void CCaptureDlg::OnAbout() ^'b\OUty-  
{ `yRt?UQRS  
 CAboutDlg dlg; Vk1 c14i>  
 dlg.DoModal(); `Q>qmf_Fi  
} ExOSHKU,e  
Z?eedVV@  
void CCaptureDlg::OnBrowse() I]91{dq  
{ a3 t||@v!  
 CString str; Y)AHM0;g  
 BROWSEINFO bi; gm: xtN  
 char name[MAX_PATH]; "Z-YZ>2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); axkNy}ct  
 bi.hwndOwner=GetSafeHwnd(); --7@rxv  
 bi.pszDisplayName=name; }ol<DV  
 bi.lpszTitle="Select folder"; VY!A]S"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; EPEn"{;U  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  I$fm"N  
 if(idl==NULL) =u5( zaBe  
  return; 5J6~]J  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); fQ2U |  
 str.ReleaseBuffer();  S^5Qhv  
 m_Path=str; M(Yt9}Z%Y  
 if(str.GetAt(str.GetLength()-1)!='\\') vH"^a/95|  
  m_Path+="\\"; nc#} \  
 UpdateData(FALSE); M&rbXi.  
} lBG"COu  
CG!9{&F  
void CCaptureDlg::SaveBmp() @@6c{r^P  
{ z{U^j:A  
 CDC dc; % )}rQqQ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (/_w23rr  
 CBitmap bm; [](] "r  
 int Width=GetSystemMetrics(SM_CXSCREEN); /jn0Xh  
 int Height=GetSystemMetrics(SM_CYSCREEN); [Lid%2O3ZR  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9_%??@^>  
 CDC tdc; i6:O9Km  
 tdc.CreateCompatibleDC(&dc); 7{OD/*|  
 CBitmap*pOld=tdc.SelectObject(&bm); a#/~rNRY  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )=#zMdK&  
 tdc.SelectObject(pOld); Gnie|[3  
 BITMAP btm; 9Om3<der  
 bm.GetBitmap(&btm); 6[a;83  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; mk3,ke8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9H cxL  
 BITMAPINFOHEADER bih; ZBc8 ^QZ  
 bih.biBitCount=btm.bmBitsPixel; D.w6/DxaXa  
 bih.biClrImportant=0; '=ydU+X  
 bih.biClrUsed=0; 42PA?^xPw  
 bih.biCompression=0; U ~8, N[  
 bih.biHeight=btm.bmHeight; #sf1,k5'  
 bih.biPlanes=1; TA"gU8YQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); x\Kt}/97e  
 bih.biSizeImage=size; zi+NQOhR  
 bih.biWidth=btm.bmWidth; "Q1oSpF  
 bih.biXPelsPerMeter=0; W`jKe-jF  
 bih.biYPelsPerMeter=0; lnrs4s Km  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =n_>7@9l  
 static int filecount=0; &^F'ME  
 CString name; z3|5E#m  
 name.Format("pict%04d.bmp",filecount++); *7yrm&@nG  
 name=m_Path+name; Lr(My3vF8q  
 BITMAPFILEHEADER bfh; *V@t]d$=#  
 bfh.bfReserved1=bfh.bfReserved2=0; %$+bO/f  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 3s,a%GOk  
 bfh.bfSize=54+size; FOSC#W9E  
 bfh.bfOffBits=54; BvpUcICJ  
 CFile bf; ] N7(<EV/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ eeOG(@@o(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M4L<u,\1s  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9G{#a#Z.  
  bf.WriteHuge(lpData,size); '.t{\  
  bf.Close(); FN D+Ok&  
  nCount++; 5Ln !>,  
 } )JA^FQ5N  
 GlobalFreePtr(lpData); 7k#0EhN1>  
 if(nCount==1) 6oq/\D$6~  
  m_Number.Format("%d picture captured.",nCount); >u?a#5R:m  
 else b}m@2DR'|m  
  m_Number.Format("%d pictures captured.",nCount); VP6_}9:9   
  UpdateData(FALSE); )bB Va^  
} H:`H4 S}  
d+IN-lR(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0@}:`OynX  
{ < *db%{  
 if(pMsg -> message == WM_KEYDOWN) `s_k+ g  
 { HurF4IsHk  
  if(pMsg -> wParam == VK_ESCAPE) +-MieiKv  
   return TRUE; ;^so;>F  
  if(pMsg -> wParam == VK_RETURN) 8MBvp*  
   return TRUE; iY3TB|tMt  
 } S1_):JvV  
 return CDialog::PreTranslateMessage(pMsg); wl%I(Cw{]  
} B3&ETi5NTU  
S+-V16{i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X->` ~-aj  
{ dwUs[v   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ A=BT2j'l)  
  SaveBmp(); Q6%Pp_$k  
  return FALSE; 8:"s3xaO3  
} md /NMC \  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x UTlM  
 CMenu pop; ~{{@m]P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )bK3%>H#  
 CMenu*pMenu=pop.GetSubMenu(0); E5t /-4  
 pMenu->SetDefaultItem(ID_EXITICON); \m~Oaf;$  
 CPoint pt; t^g+nguz  
 GetCursorPos(&pt); \_t[\&.a}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -@mcu{&  
 if(id==ID_EXITICON) 23P7%\  
  DeleteIcon(); 3u1\zse  
 else if(id==ID_EXIT) \&^U9=uq  
  OnCancel(); ~p\r( B7G  
 return FALSE; +Al* MusS  
} y6gaoj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); U/>l>J5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W%< z|  
 AddIcon(); fWl #CI\]  
 return res; 3F{R$M}  
} (Iv*sd *  
wo\O 0?d3{  
void CCaptureDlg::AddIcon() E#c9n%E\sz  
{ D]+@pK b  
 NOTIFYICONDATA data; rVDOco+w  
 data.cbSize=sizeof(NOTIFYICONDATA); dp*E#XCr1  
 CString tip; 6MelN^\[7  
 tip.LoadString(IDS_ICONTIP); B8?j"AF  
 data.hIcon=GetIcon(0); ~f?brQ?  
 data.hWnd=GetSafeHwnd(); 1cd3m  
 strcpy(data.szTip,tip); FdS'0#$  
 data.uCallbackMessage=IDM_SHELL; jluv}*If  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5ih5=qX  
 data.uID=98; a*!9RQ  
 Shell_NotifyIcon(NIM_ADD,&data); 8,]wOxwqi  
 ShowWindow(SW_HIDE); 3PaMq6Ca  
 bTray=TRUE; /7K7o8g  
} *xDV8iu_  
GCp90  
void CCaptureDlg::DeleteIcon() d"}lh:L9  
{ gyOAvx  
 NOTIFYICONDATA data; Cuo"6, M  
 data.cbSize=sizeof(NOTIFYICONDATA); -5,+gakSk  
 data.hWnd=GetSafeHwnd(); sJm v{wM  
 data.uID=98; <(BIWm*  
 Shell_NotifyIcon(NIM_DELETE,&data); ])vqXjN6"  
 ShowWindow(SW_SHOW); 8hZc#b;  
 SetForegroundWindow(); ,A>cL#Oe  
 ShowWindow(SW_SHOWNORMAL); yUg'^SEbLk  
 bTray=FALSE; )4jS}  
} CiIIlE4  
:<xf'.  
void CCaptureDlg::OnChange() H=*2A!O[_  
{ >* ]B4Q  
 RegisterHotkey(); ,-1d2y  
} M0woJt[&  
.Iv`B:4  
BOOL CCaptureDlg::RegisterHotkey() $QaEU="Z  
{ )?k~E=&o  
 UpdateData(); h`Xl~=  
 UCHAR mask=0; xhncQhf\  
 UCHAR key=0; FF#?x@N:  
 if(m_bControl) L^L.;1  
  mask|=4; >,n K  
 if(m_bAlt) N7Kkz /  
  mask|=2; F& ['w-n%  
 if(m_bShift) /5Xt<7vm8  
  mask|=1; %TzdpQp"  
  key=Key_Table[m_Key.GetCurSel()]; phy:G}F6%  
 if(bRegistered){ )9kp[hY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); cxnEcX\   
  bRegistered=FALSE; &8hW~G>(m  
 } k j&hn  
 cMask=mask; L%/atl!  
 cKey=key; 7h\U}!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &[ $t%:`  
 return bRegistered; dSbz$Fct  
} sUpSXG-W/@  
Dos';9Uq  
  四、小结 ^fti<Lw5  
%`]fZr A]#  
  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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