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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: "/hs@4{u9  
  >'^l>FPc  
  一、实现方法 +u _mT$|T  
y)U8\  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: O3*Vilx  
-tx)7KV-  
#pragma data_seg("shareddata") qd3B>f  
HHOOK hHook =NULL; //钩子句柄 2!dIW5I  
UINT nHookCount =0; //挂接的程序数目 UR-e'Z&]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 u ` 9Eh;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D4[5}NYU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~C=`yj  
static int KeyCount =0; 8%7H F:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 n<yV]i$  
#pragma data_seg() TO[5h Y\  
wSIt"g,%  
  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。 4$.UVW\  
) !ZA.sx  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: R|!4Y`  
w _eu@R:u@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR CNcH)2Mk  
cKey,UCHAR cMask) zy@ #R;  
{ & A9psc(,&  
 BOOL bAdded=FALSE; _F^|n}Qbj  
 for(int index=0;index<MAX_KEY;index++){ 6@o_MtI  
  if(hCallWnd[index]==0){ Jb$PlOQ  
   hCallWnd[index]=hWnd; OAw/  
   HotKey[index]=cKey; Q*$x!q  
   HotKeyMask[index]=cMask; /[nt=#+   
   bAdded=TRUE; J+?xfg  
   KeyCount++; \ox:/-[c\<  
   break; C&Nd|c  
  } a((5_8SX5  
 } 2T?t[;-  
 return bAdded; u[2R>=  
} #_7}O0?c3  
//删除热键 {yVi/*;f^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D (qT$#  
{ jy@}$g{  
 BOOL bRemoved=FALSE; pSq\3Hp]Q  
 for(int index=0;index<MAX_KEY;index++){ `-ENKr]  
  if(hCallWnd[index]==hWnd){ lu-VBVwR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4KybN  
    hCallWnd[index]=NULL; f<|8NQ2y.  
    HotKey[index]=0; drtQEc>qT  
    HotKeyMask[index]=0; H3OH  
    bRemoved=TRUE; Kt}dTpVFr  
    KeyCount--; pJ_Z[}d)c  
    break; 4B]8Mp~\aL  
   } #C%<g:F8  
  } o/)\Q>IY  
 } m/Yi;>I(  
 return bRemoved; 'zT/ x`V  
} GUat~[lUrj  
|Z 3POD"9  
8agd{bxU  
  DLL中的钩子函数如下: AW> P\>{RE  
NV9=~c x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C UBcU  
{ *+p'CfsSka  
 BOOL bProcessed=FALSE; d2X#_(+d  
 if(HC_ACTION==nCode) V=(4 c  
 {  ]g?G 0m  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8n~@Rj5  
   switch(wParam) ,5r 2!d  
   {  VdK-2O(.-  
    case VK_MENU: >y]YF3?  
     MaskBits&=~ALTBIT; mg >oB/,'Z  
     break; sFS_CyN!7  
    case VK_CONTROL: &Vgjd>  
     MaskBits&=~CTRLBIT;  2 H^9Qd  
     break; $8i t&/JP,  
    case VK_SHIFT: f"Iv  
     MaskBits&=~SHIFTBIT; M;Vx[s,#,  
     break; \mc~w4B[)3  
    default: //judge the key and send message &5d>jEaB}  
     break; H`@x5RjS   
   } miN(a; Q2P  
   for(int index=0;index<MAX_KEY;index++){ i@B5B2  
    if(hCallWnd[index]==NULL) a+]=3o  
     continue;  ITbl%q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k, v.U8  
    { l^0 <a<P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :syR4A WM  
     bProcessed=TRUE; \D}/tz5~B  
    } c1n? @L  
   } 7CG_UB  
  } |Z2_1( ku  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ld`~^<B  
   switch(wParam) )XO2DY1/&  
   { R!$j_H  
    case VK_MENU: _TX.}167;-  
     MaskBits|=ALTBIT; |y'q`cY  
     break; s 6hj[^O  
    case VK_CONTROL: MF E%q  
     MaskBits|=CTRLBIT; i, RK0q?>  
     break; o~GhV4vq  
    case VK_SHIFT: C!Tl?>Tt  
     MaskBits|=SHIFTBIT; s_1]&0<  
     break; ^u Z%d  
    default: //judge the key and send message o)-Qd3d%S  
     break; )UJ]IB-Q|1  
   } ^jCkM29eu  
   for(int index=0;index<MAX_KEY;index++){ 8:M~m]Z+|  
    if(hCallWnd[index]==NULL) _bMs~%?~/  
     continue; 'Y"q=@Ei9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vkR"A\:  
    { \*_a#4a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t5e(9Yhj  
     bProcessed=TRUE; ! B)Em  
    } vB.LbYyF  
   } Qgf_  
  } ied<1[~S  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R`$Odplh>  
   for(int index=0;index<MAX_KEY;index++){ HDy[/7"  
    if(hCallWnd[index]==NULL) VNytK_F0P  
     continue; }l[t0C t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V@Po}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N$=<6eQm  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 fYCAwS{  
   } +p43d:[  
  } Vx#xq#wK  
 } TUk1h\.q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e@Mm4&f[p  
} kF\ QO [  
 %gf8'Q  
  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: D@j `'&G  
2+?M(=4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X$st{@}ZB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a>Q7Qn  
U\b,W&%P  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: }QC: !e,yG  
/Hd\VI  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O~xc> w  
{ ;CU3CLn  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4`*jF'N[  
 { bTn-Pg){  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 K, 35*  
  SaveBmp(); (nV/-#*  
  return FALSE; '{Ywb@Bc  
 } -i;#4@^t  
 …… //其它处理及默认处理 )T2Sw z/  
} M=!x0V;  
h<uRlTk  
W~7q&||;C  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 n$~RgCf  
_|s{G  
  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。 @w|~:>/g  
(sPZ1Fr\o  
  二、编程步骤 mirMDJsl%  
f:BW{Cij;y  
  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"; WS,p}:yPZG  
2=U4'C4#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 61wGIN2,  
Q04N  
  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; g/T`4"p[H  
,D#~%kq~  
  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; t(s']r  
9RAN$\AKy  
  5、 添加代码,编译运行程序。 pRYt.}/K  
7W 4[1  
三、程序代码 sM-k,0z  
,>e<mphM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ?N`W,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]i{-@Ven  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ [zY9"B<3  
#if _MSC_VER > 1000 (s \Nm_j  
#pragma once Lo !kv*  
#endif // _MSC_VER > 1000 7j@TW%FmV\  
#ifndef __AFXWIN_H__ ThFI=K  
#error include 'stdafx.h' before including this file for PCH R2r0'Yx  
#endif q`qbaX\J3  
#include "resource.h" // main symbols |~uCLf>  
class CHookApp : public CWinApp L-$GQGk{  
{ *!B,|]wq=  
 public: ^IC|3sr   
  CHookApp(); )C <sj   
  // Overrides :x16N|z  
  // ClassWizard generated virtual function overrides |*8 J.H*r  
  //{{AFX_VIRTUAL(CHookApp) `+i<:,z-gs  
 public: U${dWxC  
  virtual BOOL InitInstance(); &:Raf5G-E  
  virtual int ExitInstance(); .PF~8@1ju  
  //}}AFX_VIRTUAL m:K/ )v*  
  //{{AFX_MSG(CHookApp) SVeL c  
  // NOTE - the ClassWizard will add and remove member functions here. zvSfW# *  
  // DO NOT EDIT what you see in these blocks of generated code ! E*k=8$Y  
  //}}AFX_MSG G0<m3 Up  
  DECLARE_MESSAGE_MAP() CbwQ'c$}  
}; 'S&5zwrH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6R"& !.ZF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E Xo"F*gW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \GBv@  
BOOL InitHotkey(); G;`+MgJ)  
BOOL UnInit(); |nv8&L8  
#endif _jP]ifu`  
](3=7!!J  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -u8 ma%JW  
#include "stdafx.h" 6$`8y,TMSt  
#include "hook.h" ^Z;5e@S  
#include <windowsx.h> a^|mF# z  
#ifdef _DEBUG HjL+Wg  
#define new DEBUG_NEW \vpUl  
#undef THIS_FILE (LQ*U3J]_  
static char THIS_FILE[] = __FILE__; [?_^Cy  
#endif &Q 3!ty  
#define MAX_KEY 100 {QJJw}!#  
#define CTRLBIT 0x04 td{$ c6  
#define ALTBIT 0x02 V\4'Hd  
#define SHIFTBIT 0x01 'V } -0  
#pragma data_seg("shareddata") Z+FJ cvYx  
HHOOK hHook =NULL; [N.4 i" Cd  
UINT nHookCount =0; PC=b.H8P+W  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey b$%W<D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT l2z@t3{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $xNZ.|al  
static int KeyCount =0; G4]T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift E ekX|*  
#pragma data_seg() 5_0Eh!sx  
HINSTANCE hins; 51l:  
void VerifyWindow(); CO-9-sQx  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) AvH^9zEE(  
//{{AFX_MSG_MAP(CHookApp) ioz4kG!  
// NOTE - the ClassWizard will add and remove mapping macros here. r m\]  
// DO NOT EDIT what you see in these blocks of generated code! _KLKa/3  
//}}AFX_MSG_MAP 8+^q9rLii  
END_MESSAGE_MAP() XeJn,=  
=J<3B H^m  
CHookApp::CHookApp() c7,p5[  
{ Qne@Vf kA  
 // TODO: add construction code here, bRfac/:}  
 // Place all significant initialization in InitInstance <V>]-bl/  
} 4Zo.c* BZ  
Wv8?G~>  
CHookApp theApp; KZ>cfv-&a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =g UOHH  
{ RGf&KV/  
 BOOL bProcessed=FALSE; RG0kOw0  
 if(HC_ACTION==nCode) -LhO </l  
 { J<yt/V]  
  if((lParam&0xc0000000)==0xc0000000){// Key up o7;lR?  
   switch(wParam) lvY[E9I0  
   { ot($aY,t  
    case VK_MENU: @j=:V!g2O  
     MaskBits&=~ALTBIT; pE,2pT2>  
     break; E{k$4  
    case VK_CONTROL: 9$$dSN\&  
     MaskBits&=~CTRLBIT; 3f@@|vZF  
     break; |6v $!wBi  
    case VK_SHIFT: A+de;&  
     MaskBits&=~SHIFTBIT; Q V)>+6\  
     break; &N:Iirg  
    default: //judge the key and send message u%!/-&?wF  
     break; tp*.'p-SI  
   } ^CO{86V  
   for(int index=0;index<MAX_KEY;index++){ ,)@njC?J  
    if(hCallWnd[index]==NULL) uGOED-@  
     continue; <hvs{}TS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ra) wlI x  
    { %<8`(Uu5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ct`j7[  
     bProcessed=TRUE; rP|~d}+I  
    } #9zpJ\E  
   } Swa0TiT(  
  } Ql"kJ_F!br  
  else if((lParam&0xc000ffff)==1){ //Key down )0+6^[Tqq  
   switch(wParam) 0Q?)?8_  
   { `%;Hj _X}  
    case VK_MENU: KW-GVe%8f  
     MaskBits|=ALTBIT; g&z8t;@  
     break; E@,m +  
    case VK_CONTROL: N,W ?}  
     MaskBits|=CTRLBIT; o=J-Ju  
     break; z36wWdRa6  
    case VK_SHIFT: d^MRu#]  
     MaskBits|=SHIFTBIT; 'b)qP|  
     break; _NefzZWUJ  
    default: //judge the key and send message :aQ.:b(n  
     break; mC2K &'[  
   } ~(nc<M[  
   for(int index=0;index<MAX_KEY;index++) =' uePM")  
   { 7-:R{&3Lm:  
    if(hCallWnd[index]==NULL) .V4-  
     continue; (Zg'])  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 50_[n$tqE  
    { xt_:R~/[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); aD]! eP/)  
     bProcessed=TRUE; 0FSNIPx  
    } "i#aII+T  
   } % IHIXncv[  
  }  bTU[E  
  if(!bProcessed){ <Pzy'9  
   for(int index=0;index<MAX_KEY;index++){ Lq|>n Y  
    if(hCallWnd[index]==NULL)  J3`0i@  
     continue; ijsoY\V50  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p8Z?R^$9H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |Dt_lQp#  
   } sYjhQN=Y*  
  } jr,N+K(@T  
 } jc!m; U t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '2GnAws^  
} nv0\On7wd  
#u}%r{T  
BOOL InitHotkey() o^XDG^35`  
{ SQ_Je+X  
 if(hHook!=NULL){ Q$uv \h;  
  nHookCount++; fIl;qGz85  
  return TRUE; WQ{[q" O  
 } w A\5-C7 j  
 else z/u^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {`QA.he.  
  if(hHook!=NULL) W1 k]P.  
   nHookCount++; 6<EGH*GQ$  
  return (hHook!=NULL); q`,%L1c4  
} [Ur\^wS  
BOOL UnInit() nl qn:[BU  
{ x-"8V(  
 if(nHookCount>1){  g5 T  
  nHookCount--; 0z'GN#mT5  
  return TRUE; S=(<m%f  
 } ia7<AwV  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m8ts!6C  
 if(unhooked==TRUE){ DmpT<SI+!  
  nHookCount=0; s3HVX'   
  hHook=NULL; -8xf}v~u  
 } |GtvgvO,  
 return unhooked; y{S8?$dU$:  
} d2V X\  
y(o)} m*0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p}^5ru  
{ RFMPh<Ac  
 BOOL bAdded=FALSE; 12a`,~  
 for(int index=0;index<MAX_KEY;index++){ @^A5{qQ\  
  if(hCallWnd[index]==0){ =A.$~9P  
   hCallWnd[index]=hWnd; oQ 2$z8  
   HotKey[index]=cKey; )rq |t9kix  
   HotKeyMask[index]=cMask; >~SS^I0  
   bAdded=TRUE; r/2= nE  
   KeyCount++; 5?lc%,-&  
   break; ^Jp,&  
  } )V\@N*L`ik  
 } TWzLJ63*  
 return bAdded; &)Xc'RQ.C  
} Lm TFvZ  
&^r>Q`u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OvtE)u l@  
{ DMM<,1  
 BOOL bRemoved=FALSE; 51SmoFbMz  
 for(int index=0;index<MAX_KEY;index++){ |M7cB$y  
  if(hCallWnd[index]==hWnd){ qx t0Jr8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >> zd  
    hCallWnd[index]=NULL; Y3Fj3NwS  
    HotKey[index]=0; }5-w,m{8/  
    HotKeyMask[index]=0; nN\H'{Wzd  
    bRemoved=TRUE; {%f{U"m  
    KeyCount--; X` zWw_i  
    break; gv''A"  
   } unLhI0XW  
  } TIWR[r1!  
 } (k?H T'3)  
 return bRemoved; _!nsEG VV  
} q`VL i  
WwDM^}e  
void VerifyWindow() 3 r&  
{ O$<>v\NC?  
 for(int i=0;i<MAX_KEY;i++){ :OG I|[  
  if(hCallWnd!=NULL){ iQ;p59wSzL  
   if(!IsWindow(hCallWnd)){ KwuucY  
    hCallWnd=NULL; J;C:nE|V  
    HotKey=0; uh )S;3|  
    HotKeyMask=0; 1^!SuAA@  
    KeyCount--; >Icr4?zq  
   } `#N/]4(j  
  } |_V(^b}  
 } ;]u9o}[ 2  
} VPe0\?!d  
FEaT}/h;  
BOOL CHookApp::InitInstance() =l/6-j^  
{ # z|Q $  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s/E|Z1pg3  
 hins=AfxGetInstanceHandle(); Xw-[Sf]p  
 InitHotkey();  Y{p$%  
 return CWinApp::InitInstance(); q,vWu(.  
} uM-,}7f7  
XBQt:7[<  
int CHookApp::ExitInstance() Yc:%2KZ"  
{ (N7 uaZ?Z  
 VerifyWindow(); S/nPK,^d2  
 UnInit(); qCV<-o  
 return CWinApp::ExitInstance(); 2 T!Tiu  
}  c0oHE8@  
TSlB.pw%v  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #Wk=y?sn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e-nA>v  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @^P^- B  
#if _MSC_VER > 1000 CKYg!\g(:  
#pragma once +0'F@l  
#endif // _MSC_VER > 1000 fw%`[( hK  
hH %>  
class CCaptureDlg : public CDialog p+VU:%.t  
{ .ZpOYhk  
 // Construction i%hCV o  
 public: WsI`!ez;D  
  BOOL bTray; !@xO]Jwv  
  BOOL bRegistered; Vy\Vpp  
  BOOL RegisterHotkey(); -V2\s  
  UCHAR cKey; N3%X>*'  
  UCHAR cMask; 2 !s&|lI  
  void DeleteIcon(); %rzPh<>e  
  void AddIcon(); T@ c~ql  
  UINT nCount; 0 j.K?]f)h  
  void SaveBmp(); E}@C4pS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor " kDiK`i  
  // Dialog Data J2YQdCL  
  //{{AFX_DATA(CCaptureDlg) z3o i(  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3k Ci5C  
  CComboBox m_Key; (l{vlFWd  
  BOOL m_bControl; '! [oLy  
  BOOL m_bAlt; *g/klK  
  BOOL m_bShift; =[6^NR(  
  CString m_Path; a`xq h2P  
  CString m_Number; c{z$^)A/  
  //}}AFX_DATA J:xGEa t  
  // ClassWizard generated virtual function overrides Ql*zl  
  //{{AFX_VIRTUAL(CCaptureDlg) wA) Hot  
 public: Lc3&\q e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); E+f)Zg :  
 protected: ]Bhy  =1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support oBzl=N3<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {/'T:n#  
  //}}AFX_VIRTUAL y0zMK4b  
  // Implementation +P/kfY"  
 protected: W(,j2pU  
  HICON m_hIcon; 3/G^V'Yu  
  // Generated message map functions 34@[ZKJ5  
  //{{AFX_MSG(CCaptureDlg) 8v4}h9*F"7  
  virtual BOOL OnInitDialog(); S c)^k  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _?{7%(C  
  afx_msg void OnPaint(); JJ?{V:  
  afx_msg HCURSOR OnQueryDragIcon(); Ei;tfB  
  virtual void OnCancel(); C|'DKT4M&  
  afx_msg void OnAbout(); ([>ecS@eO  
  afx_msg void OnBrowse(); hXW` n*Zw  
  afx_msg void OnChange(); /%wS5IZ^  
 //}}AFX_MSG |Splbs k  
 DECLARE_MESSAGE_MAP() %opBJ   
}; xoaO=7\io  
#endif +$2{u_m,  
S;|:ci<[=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /jbAf]"F;  
#include "stdafx.h" ?t#wK}d.  
#include "Capture.h" <`H0i*|Ued  
#include "CaptureDlg.h" ll:UIxx  
#include <windowsx.h> ZnG.::&:  
#pragma comment(lib,"hook.lib") V Z(/g"9  
#ifdef _DEBUG YOCEEh?  
#define new DEBUG_NEW $.G 7Vt  
#undef THIS_FILE Dl,QCZeM  
static char THIS_FILE[] = __FILE__; 9&6juL  
#endif %uW  =kr  
#define IDM_SHELL WM_USER+1 gP^2GnjHL8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Dg&84,bv^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jL VJ+mu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1W^hPY  
class CAboutDlg : public CDialog y<)TYr  
{ j8Z,:op  
 public: U1RU2M]v  
  CAboutDlg(); Q$jEmmm%V[  
  // Dialog Data Dk1& <} I  
  //{{AFX_DATA(CAboutDlg) 5!-TLwl`j\  
  enum { IDD = IDD_ABOUTBOX }; g: i5%1  
  //}}AFX_DATA 9}573M  
  // ClassWizard generated virtual function overrides zWsr|= [  
  //{{AFX_VIRTUAL(CAboutDlg) i\R0+ O{  
 protected: ui8 Q2{z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y\|#Lu>B  
  //}}AFX_VIRTUAL &C 9hT  
  // Implementation 3h@]cWp  
 protected: FDHW' OP4  
  //{{AFX_MSG(CAboutDlg) X>q`F;W  
  //}}AFX_MSG lu8G $EQI  
  DECLARE_MESSAGE_MAP() rfXxg^  
}; ys_2?uv  
Nw;qJ58@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 0|3I^b  
{ &|yLTx  
 //{{AFX_DATA_INIT(CAboutDlg) IwYeKN6s  
 //}}AFX_DATA_INIT rK3kg2H  
} 3jmo[<p*x  
.@1+}0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -m@o\9Ic  
{ h`[$ Bp  
 CDialog::DoDataExchange(pDX); ,75)  
 //{{AFX_DATA_MAP(CAboutDlg) *~rj!N?;  
 //}}AFX_DATA_MAP Q eeV<  
} "wUIsuG/p  
pYr"3BwG  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) J<) qw  
 //{{AFX_MSG_MAP(CAboutDlg) tbrU>KCBD  
 // No message handlers tgRj8 @  
 //}}AFX_MSG_MAP o)`PS w=  
END_MESSAGE_MAP() } ueFy<F  
aDlp>p^E>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Fs+ tcr/\[  
: CDialog(CCaptureDlg::IDD, pParent) O zAIz+`  
{ 4kOO3[r  
 //{{AFX_DATA_INIT(CCaptureDlg) #-{<d% qk  
  m_bControl = FALSE; U,P_bz*)  
  m_bAlt = FALSE; k.J%rRneN  
  m_bShift = FALSE; [4)Oi-_Y>  
  m_Path = _T("c:\\"); 4u{S?Ryy  
  m_Number = _T("0 picture captured."); Q>niJ'7WF  
  nCount=0; i'tMpS3  
  bRegistered=FALSE;  W!Tx%  
  bTray=FALSE; m/HT3<F  
 //}}AFX_DATA_INIT Qg>NJ\*Q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 rd <m:r  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w5FIHYl6B  
} I-#H+\S  
F(")ga$r  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hlVye&;b8  
{ st'T._  
 CDialog::DoDataExchange(pDX); U(&c@u%  
 //{{AFX_DATA_MAP(CCaptureDlg) %nA})nA7=  
  DDX_Control(pDX, IDC_KEY, m_Key); q0sf\|'<}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); cNll??j  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `oRyw6Sko  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 3?OQ-7,  
  DDX_Text(pDX, IDC_PATH, m_Path); sXLW';Fz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >.:+|Br`  
 //}}AFX_DATA_MAP n@p]v*  
} =SDex.ZK]  
7h' C"rH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^2+Ex+  
//{{AFX_MSG_MAP(CCaptureDlg) UQVL)-Z  
 ON_WM_SYSCOMMAND() :e1h!G  
 ON_WM_PAINT() pEyZH!W  
 ON_WM_QUERYDRAGICON() I&PJ[U#~a  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )f8>kz(  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) h]7_ N,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Mz+I YP`L  
//}}AFX_MSG_MAP ULx:2jz  
END_MESSAGE_MAP() 1{uxpYAP=  
kG^76dAQL  
BOOL CCaptureDlg::OnInitDialog() \!KE_7HRu  
{ ?Y=aO(}=h  
 CDialog::OnInitDialog(); 1]xk:u4LA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CEfqFn3^  
 ASSERT(IDM_ABOUTBOX < 0xF000); ew;;e|24  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mF~T?L"  
 if (pSysMenu != NULL) %h. zkocM  
 { U~G7~L &m  
  CString strAboutMenu; "8za'@D"f  
  strAboutMenu.LoadString(IDS_ABOUTBOX); D%>Bj>xQD  
  if (!strAboutMenu.IsEmpty()) ,05PYBc3  
  { y<`5  
   pSysMenu->AppendMenu(MF_SEPARATOR); LKN7L kl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @2(u=E:^  
  } )"x6V""Rb  
 } c~|(j \FI  
 SetIcon(m_hIcon, TRUE); // Set big icon !Vpi1N\  
 SetIcon(m_hIcon, FALSE); // Set small icon )k<cd.MX  
 m_Key.SetCurSel(0);  3@Ndn  
 RegisterHotkey(); nnlj#  
 CMenu* pMenu=GetSystemMenu(FALSE); Z[O hZ 9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); eqtZU\GI>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s.1F=u9a  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y6 (L=$+B  
 return TRUE; // return TRUE unless you set the focus to a control 4[ uqsJB  
} e=]SIR()`  
|mT%IR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =4TQ*;V:  
{ $v>q'8d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A;cA|`b  
 { _|~Dj)z  
  CAboutDlg dlgAbout; =<\22d5L  
  dlgAbout.DoModal(); R~<N*En~  
 } :>-zT[Lcn  
 else 2H%9l@}u  
 { ` w;Wud'*<  
  CDialog::OnSysCommand(nID, lParam); 14$%v;Su4  
 } xd?=#d  
} NKY|Z\  
n6Oz[7M  
void CCaptureDlg::OnPaint() QO@86{u#Y  
{ g{&5a(W&`  
 if (IsIconic()) *qpFt Bg  
 { |n_N.Z  
  CPaintDC dc(this); // device context for painting |# 0'_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 'O a3 6@  
  // Center icon in client rectangle gUiO66#x  
  int cxIcon = GetSystemMetrics(SM_CXICON); 082}=Tsx   
  int cyIcon = GetSystemMetrics(SM_CYICON); Xj, %t}  
  CRect rect; *QK) 1Y1W  
  GetClientRect(&rect); r3V1l8MV  
  int x = (rect.Width() - cxIcon + 1) / 2; 5(~Lr3v0  
  int y = (rect.Height() - cyIcon + 1) / 2; XtCIUC{r,  
  // Draw the icon lpT&v ;$`  
  dc.DrawIcon(x, y, m_hIcon); &M-vKc"d  
 } sRB=<E*_  
 else AKk=XAGW  
 { . 0dGS  
  CDialog::OnPaint(); Bzz|2/1y  
 } e'b*_Ps'  
} lxd{T3LU  
m .++nF  
HCURSOR CCaptureDlg::OnQueryDragIcon() iEn:Hh)  
{ 1dvP2E  
 return (HCURSOR) m_hIcon; ` wa;@p+j8  
} MlTC?Rp#  
NuOA'e+i  
void CCaptureDlg::OnCancel() 3a:Hx| Yg  
{ 8Z !%rS  
 if(bTray) ,ye}p 1M  
  DeleteIcon(); %g :Q?   
  CDialog::OnCancel(); c5p,~z_Dtu  
} {@X>!]  
j$ T12  
void CCaptureDlg::OnAbout() W"=l@}I  
{ $9%F1:u  
 CAboutDlg dlg; si&du  
 dlg.DoModal(); NV5qF/<M  
} #cQ5-R -1  
(iKJ~bJ  
void CCaptureDlg::OnBrowse() <zCWLj3  
{ 6B]=\H  
 CString str; |!FQQ(1b  
 BROWSEINFO bi; l/3=o}8q  
 char name[MAX_PATH]; G=y~)B}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }NDl~5  
 bi.hwndOwner=GetSafeHwnd(); GVhqNy   
 bi.pszDisplayName=name; KHx2$*E_  
 bi.lpszTitle="Select folder"; P'wo+Tn*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5mam WPw  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vom3 C9o  
 if(idl==NULL) #ss/mvc3  
  return; )4rt-_t<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); GZO:lDdA  
 str.ReleaseBuffer(); :E}y Pcw  
 m_Path=str; F'MX9P  
 if(str.GetAt(str.GetLength()-1)!='\\') :]:)c8!6  
  m_Path+="\\"; iw#~xel<ez  
 UpdateData(FALSE); !h1:AW_iz  
} Bq$IBAot  
[~Ky{:@)[  
void CCaptureDlg::SaveBmp() s[GHDQ;!  
{ ZtZ3I?%U3  
 CDC dc; lEl.'X$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _1[Wv?  
 CBitmap bm; A~xw:[zy$a  
 int Width=GetSystemMetrics(SM_CXSCREEN); gaN/ kp  
 int Height=GetSystemMetrics(SM_CYSCREEN); uD/@d'd_4L  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Muwlehuq  
 CDC tdc; Cu`  
 tdc.CreateCompatibleDC(&dc); ![Qi+xyc  
 CBitmap*pOld=tdc.SelectObject(&bm); TG;[,oa  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q z(n41@`  
 tdc.SelectObject(pOld); G,>YzjMY`  
 BITMAP btm; \k5"&]I3  
 bm.GetBitmap(&btm); {9(0s| pr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Ma!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (F^R9G|  
 BITMAPINFOHEADER bih; dC,C[7\  
 bih.biBitCount=btm.bmBitsPixel; %GTFub0 F  
 bih.biClrImportant=0; R?u(aY)P  
 bih.biClrUsed=0; a/ uo)']B  
 bih.biCompression=0; %Bw:6Y4LZ  
 bih.biHeight=btm.bmHeight; 'IY?=#xr'`  
 bih.biPlanes=1; \ Bj{.jL  
 bih.biSize=sizeof(BITMAPINFOHEADER); &]YyV.  
 bih.biSizeImage=size; Ck#e54gJX  
 bih.biWidth=btm.bmWidth; T1q27I  
 bih.biXPelsPerMeter=0; i&m_G5u88  
 bih.biYPelsPerMeter=0; U;/2\Ii  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QM8Ic,QFvo  
 static int filecount=0; R*vQvO%)h  
 CString name; ,c"J[$i$  
 name.Format("pict%04d.bmp",filecount++); VwH|ed$  
 name=m_Path+name; d<d3j9u(#  
 BITMAPFILEHEADER bfh; CNb(\]  
 bfh.bfReserved1=bfh.bfReserved2=0;  dwk%!%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tC|?Kl7  
 bfh.bfSize=54+size; uD@ ZM  
 bfh.bfOffBits=54; FD[*Q2fU  
 CFile bf; O*v&C Hd3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vyDxX  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _yg;5#3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {@CQ (  
  bf.WriteHuge(lpData,size); 0Xb\w^  
  bf.Close(); +YZo-tE  
  nCount++; |dQz(z&6{5  
 } !`%j#bv  
 GlobalFreePtr(lpData); XA<h,ONE?  
 if(nCount==1) oi|N8a2R  
  m_Number.Format("%d picture captured.",nCount); y5F+~z }{  
 else 8Azh&c  
  m_Number.Format("%d pictures captured.",nCount); +rU{-`dy9'  
  UpdateData(FALSE); 9HO9>^  
} 3F]Dh^IR9  
;U>nj],uv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V\m"Hl>VIU  
{ .O"a:^i  
 if(pMsg -> message == WM_KEYDOWN) W+ ;=8S  
 { (=uT*Cb  
  if(pMsg -> wParam == VK_ESCAPE) =q0V%h{  
   return TRUE; ( 0/M?YQF  
  if(pMsg -> wParam == VK_RETURN) i=\)[;U  
   return TRUE; QTBc_Z  
 } VOD-< "|  
 return CDialog::PreTranslateMessage(pMsg); Awa| (]  
} [ne51F5_  
}0pp"[JU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /%g9g_rt#  
{ \_O#M   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "<+~uz  
  SaveBmp(); (Ff}Y.4  
  return FALSE; %IBT85{  
} _U&HXQ8X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ UB5H8&Rf!  
 CMenu pop; Q k}RcP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Vm<_e  
 CMenu*pMenu=pop.GetSubMenu(0); 7(]F+\A3  
 pMenu->SetDefaultItem(ID_EXITICON); <&Xl b0  
 CPoint pt; jUM'f24  
 GetCursorPos(&pt); l,hOnpm9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U2m#BMV  
 if(id==ID_EXITICON) <c[\\ :Hh*  
  DeleteIcon(); N$kxf  
 else if(id==ID_EXIT) (9RfsV4^  
  OnCancel(); 7:olStK  
 return FALSE; ,93Uji[l  
} LUD .  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); d eT<)'"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "\EX)u9ze  
 AddIcon(); Xi%Og\vm5  
 return res; i*/i"W<  
} wp&G]/4m  
"7y, d%H  
void CCaptureDlg::AddIcon() *JDz0M4f  
{  7qy PI  
 NOTIFYICONDATA data; z*h:Nt%.  
 data.cbSize=sizeof(NOTIFYICONDATA); 2j8GJU/L  
 CString tip; iH4LZ  
 tip.LoadString(IDS_ICONTIP); iV/I909*''  
 data.hIcon=GetIcon(0); JD#q6 &|  
 data.hWnd=GetSafeHwnd(); JrOx nxd^  
 strcpy(data.szTip,tip); j yD3Sa3  
 data.uCallbackMessage=IDM_SHELL; [TOo 9W  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; chL1r9V)v  
 data.uID=98; pp"#pl  
 Shell_NotifyIcon(NIM_ADD,&data); s4_Dqm  
 ShowWindow(SW_HIDE); Zpg;hj5_  
 bTray=TRUE; enJ; #aA  
} Qwpni^D8j  
uQ-GJI^t  
void CCaptureDlg::DeleteIcon() (*$F7oO<  
{ 2pdeJ  
 NOTIFYICONDATA data; FShjUl>mV  
 data.cbSize=sizeof(NOTIFYICONDATA); I;NW!"pU  
 data.hWnd=GetSafeHwnd(); Ur#jJR@%3  
 data.uID=98; +Mq\3  
 Shell_NotifyIcon(NIM_DELETE,&data); P4Pc;8T@!  
 ShowWindow(SW_SHOW); N\*oL*[j  
 SetForegroundWindow(); <b H *f w  
 ShowWindow(SW_SHOWNORMAL); ,Tr&`2w  
 bTray=FALSE; 3`yO&upk  
} kyAN O  
xH\\#4/  
void CCaptureDlg::OnChange() L0"|4=  
{ 3GF67]  
 RegisterHotkey(); Uo >aQk  
} (0.oE%B",1  
I}bu  
BOOL CCaptureDlg::RegisterHotkey() %3qjgyLZ|  
{ pFY*Y>6ar  
 UpdateData(); :@i+yN cV  
 UCHAR mask=0; ~'%d]s+q  
 UCHAR key=0; Ztmh z_u7  
 if(m_bControl) =!q]0#  
  mask|=4; F2}Fuupb.  
 if(m_bAlt) ybiTWM  
  mask|=2; 7JBs7LG  
 if(m_bShift) i'li;xUhZ  
  mask|=1; B za<.E=  
  key=Key_Table[m_Key.GetCurSel()]; XiTi3vCe  
 if(bRegistered){ nrKAK^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); xR0*w7YE  
  bRegistered=FALSE; e-y$&[  
 } ?YR;o4  
 cMask=mask; d.+  
 cKey=key; v_5qE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ru 6`Z+p  
 return bRegistered; Gt#r$.]W?o  
} y\^zxG*]'  
bK%F_v3'  
  四、小结 [<f2h-V$  
%>Gb]dv?  
  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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