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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: Wd7*7']  
  u;$qJjS N  
  一、实现方法 (E0WZ $f}  
)q_,V"  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: .\oW@2,RA9  
V]--d33/a  
#pragma data_seg("shareddata") \2 DED  
HHOOK hHook =NULL; //钩子句柄 I*TTD]e'X  
UINT nHookCount =0; //挂接的程序数目 \m|5Aqs  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 vxPE=!|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?VotIruR  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /E<Q_/'Z  
static int KeyCount =0; 9e`};DE   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,]0BmlD  
#pragma data_seg() <fHHrmZ#/.  
T%%EWa<a  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。  P s>Y]  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ub8d]GZJ  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #9(+)~irz`  
cKey,UCHAR cMask) {D8opepO)  
{ |Jx:#OM  
 BOOL bAdded=FALSE; ltNI+G  
 for(int index=0;index<MAX_KEY;index++){ v+x<X5u  
  if(hCallWnd[index]==0){ z{3`nd,  
   hCallWnd[index]=hWnd; h$`m0-'  
   HotKey[index]=cKey; HR?T  
   HotKeyMask[index]=cMask; Wy-_}wqHg  
   bAdded=TRUE; AAfU]4u0S  
   KeyCount++; ,K}"o~z  
   break; f B<Qs.T  
  } O8#]7\)  
 } t"Du  
 return bAdded; <UO[*_,\  
} ^E/6 vG  
//删除热键 OH>Gc-V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vUbgSI  
{ .^A4w;jPU  
 BOOL bRemoved=FALSE; D,..gsg  
 for(int index=0;index<MAX_KEY;index++){ ^/?7hbr  
  if(hCallWnd[index]==hWnd){ |s/Kb]t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VOj7Tz9UD  
    hCallWnd[index]=NULL; 6k@F?qHS  
    HotKey[index]=0; w|G7h=  
    HotKeyMask[index]=0; fPTLPcPP  
    bRemoved=TRUE; TqN@l\  
    KeyCount--; v @M6D}  
    break; }~LGq.H  
   } On O_7'4 t  
  } >.UEs 8QV  
 } DW,ERQ^  
 return bRemoved; {w3<dfJ  
} pFd{Tdh  
91R7Rrne  
vxf09v{-  
  DLL中的钩子函数如下: ABoB=0.l  
Fp?M@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #@YKNS[  
{ Ge=6l0  
 BOOL bProcessed=FALSE; U4dfO=  
 if(HC_ACTION==nCode) *?Wz/OJ0  
 { ~h<T0Zc  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p/0dtnXa(  
   switch(wParam) sE]z.Po=  
   {  N68]r 3/K  
    case VK_MENU: V1Ft3Msq  
     MaskBits&=~ALTBIT; hy#nK:B  
     break; ,^ ,R .T  
    case VK_CONTROL: m~=VUhPd  
     MaskBits&=~CTRLBIT; B7qi|Fw  
     break; 1Bs  t|  
    case VK_SHIFT: j/oc+ M^  
     MaskBits&=~SHIFTBIT; _T.`+0UV  
     break; aW_Y  
    default: //judge the key and send message ~a  V5  
     break; zE8_3UC  
   } 3s]o~I2x  
   for(int index=0;index<MAX_KEY;index++){ ]srL>29_b  
    if(hCallWnd[index]==NULL) 0ie)$fi  
     continue; Vq#0MY)2gS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bhDqRM  
    { g'km*EV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jp_)NC/~g  
     bProcessed=TRUE; Cs"ivET  
    } .(p_YjIA  
   } P;XA|`&  
  } kn$SG  
  else if((lParam&0xc000ffff)==1){ //有键按下 d$\n@}8eZp  
   switch(wParam) 1M)88&  
   { )X*_oH=  
    case VK_MENU: 1)}hzA  
     MaskBits|=ALTBIT; u-.5rH l  
     break; #Q_Scxf  
    case VK_CONTROL: !j  #8zN  
     MaskBits|=CTRLBIT; u*\QVOF  
     break; dw}ge,bBic  
    case VK_SHIFT: Tl"r#  
     MaskBits|=SHIFTBIT; vfT @;`  
     break; iX2exJto  
    default: //judge the key and send message V?T&>s  
     break; ErA*a3  
   } 9;*B*S~znW  
   for(int index=0;index<MAX_KEY;index++){ DV?c%z`YO  
    if(hCallWnd[index]==NULL) ae3 Gn }tf  
     continue; 0ZD)(ps|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sjLm-pn3  
    { xzx~H>M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6e,IjocsB  
     bProcessed=TRUE; mbhh  
    } |w~*p N0  
   } ,3G B9  
  } oKkDG|IE  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 wE9z@\z]  
   for(int index=0;index<MAX_KEY;index++){  R'_F9\  
    if(hCallWnd[index]==NULL) m/g[9Y  
     continue; ,Cm1~ExJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;)f,A)(Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); asvM/ 9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3# 0Nd"/0  
   } P _Gu~B!Y  
  } /&=y_%VR  
 } {O=_c|u{N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Y^#>3T  
} >;M STHeW  
bjwl21;{  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ]~3a~  
Y2uy@j*N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /viBJ`-O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hG<W *g  
R4[|f0l}s  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: #8vl2qWbi  
T-s[na(/L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )ARV>(  
{ FgP{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) +*qTZIXj  
 { !8 l &%  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r;waT@&C  
  SaveBmp(); {A MAQ  
  return FALSE; A$zC$9{0I  
 } ?56;<%0  
 …… //其它处理及默认处理 s<C66z  
} p)Ht =~  
Ba%b]vp  
\@NnL\ t u  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 G&N),wsNZK  
zLS?: yq  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 1TN+pmc}@  
?ZKIs9E[m  
  二、编程步骤 ]K5j(1EN  
68qCY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ,0,& L  
?[5_/0L,=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; sU^K5oo  
`9f7H  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Y$hLsM\%  
~ ^~+p  
  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; !r*JGv=  
L_zB/(h  
  5、 添加代码,编译运行程序。 .,p@ee$q  
'A/{7*,  
三、程序代码 Co<F<eXe  
B]#iZ,Tp  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #@M'*X_%}K  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V8%( h[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dlV HyCW  
#if _MSC_VER > 1000 TPKm>5g  
#pragma once _(@ezX.p  
#endif // _MSC_VER > 1000 b]Lp_t  
#ifndef __AFXWIN_H__ :7qJ[k{g  
#error include 'stdafx.h' before including this file for PCH >6zWOYd  
#endif ,f~8:LHq  
#include "resource.h" // main symbols ~X) 1!Sr  
class CHookApp : public CWinApp K;g6V!U  
{ b:*( f#"q  
 public: "? 5@j/ e`  
  CHookApp(); -A"0mS8L  
  // Overrides g3'yqIjQL  
  // ClassWizard generated virtual function overrides >ufN[ab  
  //{{AFX_VIRTUAL(CHookApp) GtqA@&5&  
 public: c#[d7t8ONe  
  virtual BOOL InitInstance(); a&n}pnEn)  
  virtual int ExitInstance(); hya $Vp  
  //}}AFX_VIRTUAL `=W#owAF  
  //{{AFX_MSG(CHookApp) [k,FJ5X  
  // NOTE - the ClassWizard will add and remove member functions here. d6e]aO=g  
  // DO NOT EDIT what you see in these blocks of generated code ! LaIH3!M3  
  //}}AFX_MSG GmN~e*x>p  
  DECLARE_MESSAGE_MAP() n#5pd;!n  
}; "4QD\k5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); `uqsYY`V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HO8x:2m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kkV* #IZ  
BOOL InitHotkey(); K./L'Me  
BOOL UnInit(); J35[GZ';D  
#endif ;MKfssG  
YksJ$yH^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >56;M7b(K  
#include "stdafx.h" 5AAPtZ\lH  
#include "hook.h" <K~mg<ff$  
#include <windowsx.h> YjeHNPf  
#ifdef _DEBUG PKNpR  
#define new DEBUG_NEW Si[xyG6=  
#undef THIS_FILE uI&<H T?  
static char THIS_FILE[] = __FILE__; IlP@a[:_  
#endif 0p \,}t\E  
#define MAX_KEY 100 l:"zYcp%  
#define CTRLBIT 0x04 5sF?0P;ln  
#define ALTBIT 0x02 jE, oEt O;  
#define SHIFTBIT 0x01  .Aa(  
#pragma data_seg("shareddata") _dw6 C2]P  
HHOOK hHook =NULL; - z"D_5  
UINT nHookCount =0; l*4_  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CEb al\R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6%UhP;(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I/w=!Ih  
static int KeyCount =0; pS<j>y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift cvv(OkC  
#pragma data_seg() 0VlB7oF  
HINSTANCE hins; y{uN+QS  
void VerifyWindow(); vEb_z[gd  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9|LV x3]  
//{{AFX_MSG_MAP(CHookApp) zF=E5TL-,4  
// NOTE - the ClassWizard will add and remove mapping macros here. Ru^j~Cj5  
// DO NOT EDIT what you see in these blocks of generated code! <-a6'g2y  
//}}AFX_MSG_MAP -MH~1Tw6Z  
END_MESSAGE_MAP() 9iQc\@eGd  
rXg#_c5j  
CHookApp::CHookApp() b+ v!3|  
{ NYN(2J  
 // TODO: add construction code here, K.2l)aRd  
 // Place all significant initialization in InitInstance # Q_ d  
} x4bj?=+  
7<3eB)S  
CHookApp theApp; UZRCJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C{Er%  
{ O'<cEv'B*  
 BOOL bProcessed=FALSE; g_t1(g*s  
 if(HC_ACTION==nCode) SAw. 6<Wy-  
 { l?LP:;S  
  if((lParam&0xc0000000)==0xc0000000){// Key up _0]{kB.$_  
   switch(wParam) B[6y2+6$0  
   { .6nNqGua1  
    case VK_MENU: C Ejf&n  
     MaskBits&=~ALTBIT; ax+P) yz  
     break; h"+|)'*n  
    case VK_CONTROL: OQm-BL   
     MaskBits&=~CTRLBIT; FYu=e?L  
     break; ZAcW@xfb  
    case VK_SHIFT: By-A1|4Cp`  
     MaskBits&=~SHIFTBIT; !9JK95;  
     break; 1K'.QRZMb9  
    default: //judge the key and send message Oe*+pReSD  
     break; _; ].  
   } 8'X:}O/  
   for(int index=0;index<MAX_KEY;index++){ A~UDtXN*4  
    if(hCallWnd[index]==NULL) ~%o?J"y  
     continue; $Sfx0?'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \%D/]"@r  
    { h q& 2o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hJ1:#%Qe.  
     bProcessed=TRUE; XN1\!CM8  
    } .TTXg,8#D  
   } rG|*74Q]  
  } b!Z-HL6  
  else if((lParam&0xc000ffff)==1){ //Key down l^ aUN  
   switch(wParam) <rs"$JJV  
   { <n:j@a\up0  
    case VK_MENU: zf>r@>S!L  
     MaskBits|=ALTBIT; }TS4D={1  
     break; <MH| <hP  
    case VK_CONTROL: tv1Z%Mx?Cp  
     MaskBits|=CTRLBIT; =8F]cW'1`  
     break; SXx2   
    case VK_SHIFT: 7VQk$im399  
     MaskBits|=SHIFTBIT; WhHnF*I  
     break; z rV  
    default: //judge the key and send message zT5@wm  
     break; /"M7YPX;  
   } -K K)}I`  
   for(int index=0;index<MAX_KEY;index++) 9e|]H+y  
   { ^"!j m  
    if(hCallWnd[index]==NULL) ]M;aVw<!  
     continue; ywRw i~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .(8sa8{N  
    { V:w=h>z8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Iv5 agh%  
     bProcessed=TRUE; hh!^^emo  
    } .w`1;o  
   } aI6fPQe  
  } ['SZe0  
  if(!bProcessed){ okO^ /"  
   for(int index=0;index<MAX_KEY;index++){ g0!{CW  
    if(hCallWnd[index]==NULL) Uxq9H  
     continue; cH!w;U b]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {)QSxO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *MEDV1l_T  
   } n"1LVJN7  
  } z5G$'  
 } clZ jb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q! +?  
} p/a)vN+*x'  
B>CG/]  
BOOL InitHotkey() <d\Lvo[  
{ 9)a:8/Y  
 if(hHook!=NULL){ /k(KA [bS  
  nHookCount++; "c6(=FFq  
  return TRUE; 6-@ X  
 } Y!6,ty'  
 else ]~SOGAFW  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); JPX5Jm()  
  if(hHook!=NULL) %y/8i%@6  
   nHookCount++; #*[G,s#t^  
  return (hHook!=NULL); :Q\{LBc  
} rN'')n/F  
BOOL UnInit() _O-ZII~  
{ uV:;q>XM'%  
 if(nHookCount>1){ xYJ|G=h&A  
  nHookCount--; oD]riA>jC  
  return TRUE; ]KS|r+  
 } i$Q$y hT{  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2U-F}Z  
 if(unhooked==TRUE){ Qifjv0&;u  
  nHookCount=0; G6N$^HkW?  
  hHook=NULL; Dwq}O  
 } e)[>E\u_  
 return unhooked; j zaC  
} V(%L}0[]  
v}v! hs Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /\S1p3EW*  
{ "YUyM5X  
 BOOL bAdded=FALSE; IQFt4{aK3  
 for(int index=0;index<MAX_KEY;index++){ j7vp@l6`L  
  if(hCallWnd[index]==0){ L+}q !'8S  
   hCallWnd[index]=hWnd; ptS1d$  
   HotKey[index]=cKey; )vFJx[a<n`  
   HotKeyMask[index]=cMask; R(c:#KF#8  
   bAdded=TRUE; jrMY]Ea2`  
   KeyCount++; r?s,  
   break; 8\BCC1K  
  } +6=2B0$ r  
 } KrhAObK  
 return bAdded; i>n.r_!E  
} a$7}_kb  
btC 0w^5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f((pRP   
{ \(PC#H%  
 BOOL bRemoved=FALSE; = dyApR:'  
 for(int index=0;index<MAX_KEY;index++){ tp='PG.6  
  if(hCallWnd[index]==hWnd){ +`_I !  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ f&w8o5=|I  
    hCallWnd[index]=NULL; w7H.&7rF  
    HotKey[index]=0; ZI  q!ee  
    HotKeyMask[index]=0; kMGK 8y  
    bRemoved=TRUE; _R!KHi  
    KeyCount--; sbZ$h <  
    break; P< +5So0  
   } 18|i{fE;  
  } ;* vVucx  
 } zDbjWd  
 return bRemoved; 1sL#XB$@N  
} L~yu  
G:f\wK[  
void VerifyWindow() "#H@d+u  
{ J`T1 88  
 for(int i=0;i<MAX_KEY;i++){ (~~*PT-  
  if(hCallWnd!=NULL){ W|K"0ab  
   if(!IsWindow(hCallWnd)){ :/N/u5.]  
    hCallWnd=NULL; &C eG4_Mi  
    HotKey=0; 7q&//*%yF  
    HotKeyMask=0; 9]AiaV9  
    KeyCount--; biCX: m+_?  
   } 3Zm'09A-.  
  } -_bHLoI  
 } 6~KtT{MYQ  
} ceakTAB[  
 5:mS~  
BOOL CHookApp::InitInstance() " h,<PF  
{ )P:r;a'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); VJ` c/EVIt  
 hins=AfxGetInstanceHandle(); z z@;UbD"  
 InitHotkey(); 1]HEwTT/1_  
 return CWinApp::InitInstance(); FE+Y#  
} $EjM )  
4J=6A4O5Z  
int CHookApp::ExitInstance() 3:Aw.-,i\  
{ ""[(e0oA  
 VerifyWindow(); 7 tOOruiC  
 UnInit(); |s&jWM$  
 return CWinApp::ExitInstance(); <$#b3F"I  
} (U"Ub;[7  
Y}_J@&:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ?dJ-g~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {*VCR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gC81ICM  
#if _MSC_VER > 1000 \ltA&}!  
#pragma once [|ghq  
#endif // _MSC_VER > 1000 2IgTB|2  
mE3^5}[>  
class CCaptureDlg : public CDialog B+G,v:)R6z  
{ nezdk=8J/  
 // Construction rlEp&"+|M  
 public: " gB.  
  BOOL bTray; ?@U7tNI  
  BOOL bRegistered; ].f28bY  
  BOOL RegisterHotkey(); G3{t{XkV  
  UCHAR cKey; TqbDj|7`R  
  UCHAR cMask; \\80c65-  
  void DeleteIcon(); jd9GueV*(  
  void AddIcon(); -LF0%G  
  UINT nCount; +u1meh3u  
  void SaveBmp(); h_K(8{1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 49%qBO$R  
  // Dialog Data @SREyqC4  
  //{{AFX_DATA(CCaptureDlg) VvuwgJX  
  enum { IDD = IDD_CAPTURE_DIALOG }; +.N3kH  
  CComboBox m_Key; 0MK|spc  
  BOOL m_bControl; G1 ?."  
  BOOL m_bAlt; +8e~jf3E1  
  BOOL m_bShift; | ,bCYK  
  CString m_Path; __p\`3(,'  
  CString m_Number; E DuLgg@  
  //}}AFX_DATA Qe=,EXf  
  // ClassWizard generated virtual function overrides k!e \O>+  
  //{{AFX_VIRTUAL(CCaptureDlg) 8(R%?> 8  
 public: ueO&%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); {C>.fg%t  
 protected: N&`VMEB)k  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "4c ?hH:C  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ue:'55  
  //}}AFX_VIRTUAL 7^|oO~x6  
  // Implementation <3dmY=  
 protected: i6R2R8  
  HICON m_hIcon; +I$c+WfU  
  // Generated message map functions B4^+&B#  
  //{{AFX_MSG(CCaptureDlg) WvG0hts=[  
  virtual BOOL OnInitDialog(); cE}R7,y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); z?$F2+f&  
  afx_msg void OnPaint(); {HKd="%VG  
  afx_msg HCURSOR OnQueryDragIcon(); G}aw{Vbg_  
  virtual void OnCancel(); # Ny  
  afx_msg void OnAbout(); WVc3C-h,  
  afx_msg void OnBrowse(); v?zA86d_  
  afx_msg void OnChange(); xaO9?{O  
 //}}AFX_MSG TJ@@k SSbl  
 DECLARE_MESSAGE_MAP() 3F'{JP  
}; H`/Q hE  
#endif W=T3sp V  
c"OBm#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aC0[OmbG  
#include "stdafx.h" y2k '^zE  
#include "Capture.h" jU2Dpxkt  
#include "CaptureDlg.h"  %Gp%l  
#include <windowsx.h> JzD Mx?  
#pragma comment(lib,"hook.lib") W:q79u yX  
#ifdef _DEBUG 5t]}(.0+  
#define new DEBUG_NEW +TW9BU'a^  
#undef THIS_FILE -"qw5Y_oF?  
static char THIS_FILE[] = __FILE__; ^|^ek  
#endif :34#z.O  
#define IDM_SHELL WM_USER+1 ;seD{y7!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %4#,y(dO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rj[2XIO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c|<*w[%C  
class CAboutDlg : public CDialog  ,lX5-1H  
{ Rk2V[R.`S  
 public: |FZ)5  
  CAboutDlg(); 74YMFI   
  // Dialog Data * z|i{=W F  
  //{{AFX_DATA(CAboutDlg) 5b X*8H D  
  enum { IDD = IDD_ABOUTBOX }; x\t)uM%  
  //}}AFX_DATA r\7F}ZW/  
  // ClassWizard generated virtual function overrides =[%ge{,t  
  //{{AFX_VIRTUAL(CAboutDlg) :USN`"  
 protected: *Dr-{\9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 12 HBq8o  
  //}}AFX_VIRTUAL `]^0lD=eI  
  // Implementation jf0D  
 protected: OjxaA[$  
  //{{AFX_MSG(CAboutDlg) 2XhtK  
  //}}AFX_MSG sg"J00  
  DECLARE_MESSAGE_MAP() }:u" ?v=|j  
}; L3:dANG  
1qWIku  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K*;e>{p  
{ hn9'M!*:O  
 //{{AFX_DATA_INIT(CAboutDlg) w~J 7|8Y  
 //}}AFX_DATA_INIT n>]`8+a~%X  
} `f.okqBAh  
,"?h _NbF  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [.\uHt  
{ Df;EemCh  
 CDialog::DoDataExchange(pDX); H..g2;D  
 //{{AFX_DATA_MAP(CAboutDlg) P3|_R HIb  
 //}}AFX_DATA_MAP 4\'1j|nS[  
} pG?AwB~@n  
`N$:QWJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SS?^-BI  
 //{{AFX_MSG_MAP(CAboutDlg) &phers  
 // No message handlers /BB(riG  
 //}}AFX_MSG_MAP ^VsX9  
END_MESSAGE_MAP() ~!( (?8"  
+2%ih !  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) lSv?!2  
: CDialog(CCaptureDlg::IDD, pParent) XWH{+c"  
{ Il(p!l<Xz#  
 //{{AFX_DATA_INIT(CCaptureDlg) om%L>zfB  
  m_bControl = FALSE; );T0n  
  m_bAlt = FALSE; C^ngdba\  
  m_bShift = FALSE; \l^L?69  
  m_Path = _T("c:\\"); :^7P. lhK  
  m_Number = _T("0 picture captured."); e?W-vi%  
  nCount=0; '<N^u@tF7  
  bRegistered=FALSE; 4W7  
  bTray=FALSE; i#/,Q1yEn  
 //}}AFX_DATA_INIT 2NS(;tBB0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'n`+R~Kkh  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d-e6hI4b  
} b-pZrnZ!  
'6l4MR$j&m  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ^z&eD,  
{ -2NXQ+m ;  
 CDialog::DoDataExchange(pDX); *^j'G^n  
 //{{AFX_DATA_MAP(CCaptureDlg) R`}C/'Ty  
  DDX_Control(pDX, IDC_KEY, m_Key); 7_Yxz$m  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); X v[5)4N  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6&8([J  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); yuyI)ebC  
  DDX_Text(pDX, IDC_PATH, m_Path); Vfkm{*t)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); hV5Aw;7C  
 //}}AFX_DATA_MAP O <;Au|>*  
} kTQ.7mo/\'  
USgZ%xk2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) up+W[#+  
//{{AFX_MSG_MAP(CCaptureDlg) v+a$Xh3Y~  
 ON_WM_SYSCOMMAND() u{#}Lo>B #  
 ON_WM_PAINT() e>yPFXSk  
 ON_WM_QUERYDRAGICON() Y~ j.Kt  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (Fc\*Vn  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2$=U#!OtU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \Fd6Q_  
//}}AFX_MSG_MAP NfG<!  
END_MESSAGE_MAP() B/"TaXVU  
YbaaX{7^  
BOOL CCaptureDlg::OnInitDialog() >*jcXao^  
{ 8K: RoR  
 CDialog::OnInitDialog(); O@*7O~eO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); USF9sF0l  
 ASSERT(IDM_ABOUTBOX < 0xF000); @qP uYFnw  
 CMenu* pSysMenu = GetSystemMenu(FALSE); N?cvQR{r9  
 if (pSysMenu != NULL) S0,q@LV  
 { !*2cK>`  
  CString strAboutMenu; K%NNw7\A  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZL!,s#  
  if (!strAboutMenu.IsEmpty()) Ze `=n  
  { bf1Tky=/  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0,~f"Dyqy  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); a7?z{ssEi  
  } b1rW0}A  
 } tC;L A 4  
 SetIcon(m_hIcon, TRUE); // Set big icon O~3<P3W  
 SetIcon(m_hIcon, FALSE); // Set small icon <sU?q<MC  
 m_Key.SetCurSel(0); BE,XiH;  
 RegisterHotkey(); ?`9XFE~a!  
 CMenu* pMenu=GetSystemMenu(FALSE); m\9R;$ \  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yV{&x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); zNAID-5K;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h"~i&T h  
 return TRUE; // return TRUE unless you set the focus to a control m9yi:zT%  
} ?'RB)M=Og7  
E?\&OeAkO  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n7Em t$Hi>  
{ 2x PkQOj3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) NC]]`O2r@  
 { 2o8:[3C5  
  CAboutDlg dlgAbout; >"LHr&;m&h  
  dlgAbout.DoModal(); ^HS;\8Xvb  
 } PE!/n6  
 else b2L9%8h  
 { @#HB6B  
  CDialog::OnSysCommand(nID, lParam); 9jwcO)p^  
 } Ej_>*^b  
} G6W_)YL  
}s+ t*z  
void CCaptureDlg::OnPaint() ibzcO,c  
{ y]3`U UvXD  
 if (IsIconic()) _H{6{!=y  
 { /-J  
  CPaintDC dc(this); // device context for painting .>QzM>zO  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U-F\3a;&  
  // Center icon in client rectangle W=E+/ZvPt  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5OHg% ^  
  int cyIcon = GetSystemMetrics(SM_CYICON); Lzr&Q(mL  
  CRect rect; F~bDA~  
  GetClientRect(&rect); v,T :V#f^  
  int x = (rect.Width() - cxIcon + 1) / 2; DIqM\ ><  
  int y = (rect.Height() - cyIcon + 1) / 2; |}^me7C,[  
  // Draw the icon "|N58%  
  dc.DrawIcon(x, y, m_hIcon); 'SW%EVB  
 } Bf5Z  
 else QR+xPY~  
 { 0B}O&DC%|  
  CDialog::OnPaint(); 0H$6_YX4 A  
 } ON(OYXj  
} -FOn%7r#Y  
RB\ Hl  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]izrr  
{ bEQy5AX  
 return (HCURSOR) m_hIcon; %rFR:w`{  
} x3>ZO.Q  
lw\+!}8(  
void CCaptureDlg::OnCancel() \eF _Xk[  
{ 9f#~RY|#m  
 if(bTray) !+UU[uM  
  DeleteIcon(); ~^{>!wU+  
  CDialog::OnCancel(); 34*73WxK  
} R"wBDWs  
='W=  
void CCaptureDlg::OnAbout() y ;/T.W9!  
{ .2Q4EbM2  
 CAboutDlg dlg; W)X" G3  
 dlg.DoModal(); Fe[)-_%G  
} gg0rkg  
-gQtw% `x  
void CCaptureDlg::OnBrowse() T }}T`Ce  
{ kk`K)PESi  
 CString str; ^l:~r2  
 BROWSEINFO bi; PFKl6_(  
 char name[MAX_PATH]; aM7e?.rU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); cyMvjzzRN  
 bi.hwndOwner=GetSafeHwnd(); u1}/SlCp  
 bi.pszDisplayName=name; K N Y  
 bi.lpszTitle="Select folder"; "|Ke/0rGB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; f};RtRo2  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _2-fH  
 if(idl==NULL) *5QN:  
  return; @Ojbu@A  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A`B>fI  
 str.ReleaseBuffer(); 0&~ JC>S  
 m_Path=str; oSf6J:?*e  
 if(str.GetAt(str.GetLength()-1)!='\\') H|Y*TI2vf8  
  m_Path+="\\"; "u.'JE;j  
 UpdateData(FALSE); ~GLWhe-  
} A'tv[T d8,  
_4f=\  
void CCaptureDlg::SaveBmp() _v#Vf*#  
{ dc dVB>D  
 CDC dc; l\/uXP?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S.zY0  
 CBitmap bm; ]+k]Gbty6  
 int Width=GetSystemMetrics(SM_CXSCREEN); +=`*`eP:U  
 int Height=GetSystemMetrics(SM_CYSCREEN); yMz dM&a!*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); WK.K-bd  
 CDC tdc; Ueu~803~  
 tdc.CreateCompatibleDC(&dc); Z,~PW#8<&  
 CBitmap*pOld=tdc.SelectObject(&bm); ;=UkTn}N?l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !C;$5(k  
 tdc.SelectObject(pOld); U]]ON6Y&F  
 BITMAP btm;  nb\pBl  
 bm.GetBitmap(&btm); ~<Z7\yS)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; cCuK?3V4K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =E$B0^_2RC  
 BITMAPINFOHEADER bih; -l~+cI\2  
 bih.biBitCount=btm.bmBitsPixel; NI:3hfs  
 bih.biClrImportant=0; *7w,o?l  
 bih.biClrUsed=0; RhWW61!"  
 bih.biCompression=0; ,_UTeW6M  
 bih.biHeight=btm.bmHeight; ":_~(?1+  
 bih.biPlanes=1; hRNnj  
 bih.biSize=sizeof(BITMAPINFOHEADER); <c&Nm_)  
 bih.biSizeImage=size; $!vK#8-&{  
 bih.biWidth=btm.bmWidth; {pXqw'"1.  
 bih.biXPelsPerMeter=0; oO^=%Mc(  
 bih.biYPelsPerMeter=0; aM4-quaG]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); pupt__NZ)n  
 static int filecount=0; ,B:r^(}0j  
 CString name; /?1^&a  
 name.Format("pict%04d.bmp",filecount++); wzF%R {;  
 name=m_Path+name; hs*n?vxp3  
 BITMAPFILEHEADER bfh; vO)]~AiB  
 bfh.bfReserved1=bfh.bfReserved2=0; X>i{288M3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e8eNef L$  
 bfh.bfSize=54+size; T|2v1Vj  
 bfh.bfOffBits=54; r3+   
 CFile bf; AqT}^fS  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ '?$R YU,  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); B2Kh~Xd  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); K@vU_x0Sl  
  bf.WriteHuge(lpData,size); t[/APm-k~>  
  bf.Close(); *mkVk7]c  
  nCount++; 4>Y*owa4  
 } I 9<%fv  
 GlobalFreePtr(lpData); Y[s}?Xu]w#  
 if(nCount==1) 2AW*PDncxP  
  m_Number.Format("%d picture captured.",nCount); NFPWh3),f  
 else x@@bC=iY$  
  m_Number.Format("%d pictures captured.",nCount); !xU[BCbfYV  
  UpdateData(FALSE); 3U'l'H,  
} +(Jh$b_  
"|BSGV!8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "-Pz2QJY  
{ C%|m[,Gx  
 if(pMsg -> message == WM_KEYDOWN) _Nh`-R%B)  
 { ZcN#jnb0/  
  if(pMsg -> wParam == VK_ESCAPE) /CUBs!  
   return TRUE; o?^Rw*u0/  
  if(pMsg -> wParam == VK_RETURN) O"#/>hmv-  
   return TRUE; kJ?AAPC  
 } <O.|pJus  
 return CDialog::PreTranslateMessage(pMsg); O=jzz&E+  
} 4HpKKhv"  
K'y|_XsBB)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @aP1[(m  
{ :%h|i&B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \}!/z]u  
  SaveBmp(); aMGyV"6(-6  
  return FALSE; F\jawoO9  
} ,20l` :  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ L4ZB0PmN'  
 CMenu pop; G_M8? G0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); P-DW@drxF  
 CMenu*pMenu=pop.GetSubMenu(0); Tv9\` F[  
 pMenu->SetDefaultItem(ID_EXITICON); xUTTRJ(\  
 CPoint pt; cdN=HM~I  
 GetCursorPos(&pt); -e>Z!0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !JBj%|!  
 if(id==ID_EXITICON) Z@bSkO<Y  
  DeleteIcon(); `lrNH]B  
 else if(id==ID_EXIT) cgO<%_l3`  
  OnCancel(); &Mz]y?k'  
 return FALSE; ^9><qKbO  
} rM? J40&.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 06?d#{?M1o  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) HA[7)T N1E  
 AddIcon(); /(?s\}O  
 return res; 3#Iq5vT  
} Rd<K.7&A}  
qFl|q0\ A  
void CCaptureDlg::AddIcon() zFQm3!.  
{ y;(G%s1  
 NOTIFYICONDATA data; xdVsbW)L2  
 data.cbSize=sizeof(NOTIFYICONDATA); Dy:r)\KX  
 CString tip; +"1-W> HV  
 tip.LoadString(IDS_ICONTIP); yE~D0%Umq  
 data.hIcon=GetIcon(0); 4dm0:, G  
 data.hWnd=GetSafeHwnd(); |9p0"#4u  
 strcpy(data.szTip,tip); @ 2On`~C`  
 data.uCallbackMessage=IDM_SHELL; 7u rD  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; jeB"j  
 data.uID=98; m4yWhUi(o  
 Shell_NotifyIcon(NIM_ADD,&data); Q- w_ @~  
 ShowWindow(SW_HIDE); jfVw{\l  
 bTray=TRUE; ZAn9A>5_  
} > 6=3y4tP  
IkG;j+=  
void CCaptureDlg::DeleteIcon() Az-!X!O*f  
{ ,6o tm  
 NOTIFYICONDATA data; @sW!g;\T  
 data.cbSize=sizeof(NOTIFYICONDATA); PIdGis5G  
 data.hWnd=GetSafeHwnd(); < +k dL  
 data.uID=98; @yC3a)=$L  
 Shell_NotifyIcon(NIM_DELETE,&data); dK0H.|  
 ShowWindow(SW_SHOW); D6"d\F m<  
 SetForegroundWindow(); t<j_` %`8  
 ShowWindow(SW_SHOWNORMAL); L}'^FqO[IW  
 bTray=FALSE; KXpbee  
} &|#,Bsk"@  
M?o_J4  
void CCaptureDlg::OnChange() `~=NBN=tiL  
{ zbGZ\pz  
 RegisterHotkey(); /8<c~  
} S]Di1E^r;_  
6urU[t1  
BOOL CCaptureDlg::RegisterHotkey() 6'.)z ,ts  
{ E25w^x2  
 UpdateData(); P,(_y8  
 UCHAR mask=0; g++-v HD  
 UCHAR key=0; EEo I|  
 if(m_bControl) _%23L|  
  mask|=4; Mz86bb^J  
 if(m_bAlt) M%RH4%NZ0  
  mask|=2; &pR 8sySu  
 if(m_bShift) TA qX f_  
  mask|=1; l?YO!$  
  key=Key_Table[m_Key.GetCurSel()]; >YsM'.EFD  
 if(bRegistered){ 7\ZSXQy1W  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g_A#WQyh\'  
  bRegistered=FALSE; 7%[ YX  
 } |.$7.8g  
 cMask=mask; MOay^{u  
 cKey=key; xE$lx:C"FU  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); K-K>'T9F}  
 return bRegistered; fVVD}GM=  
} P,xJVo\  
=BJe}AV  
  四、小结 b TZ.y.sI  
Q04 `+Vr  
  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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