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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: >>$IHz4Z"  
  ){YPP!8cI  
  一、实现方法 4(aesZ8h  
cZ!s/^o?f  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: \aZ(@eF@@Q  
U[A*A^$c}  
#pragma data_seg("shareddata") Ab2g),;c  
HHOOK hHook =NULL; //钩子句柄 CY>NU  
UINT nHookCount =0; //挂接的程序数目 l(]\[}.5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5&X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ZHC sv]l  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [QZ~~(R  
static int KeyCount =0; zt,-O7I'1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %o"Rcw|  
#pragma data_seg() 9uS7G*  
 +rT(  
  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。 }qD.Ek  
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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: _).'SU)>  
W;N/Y3Lb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 'hek CZZ_I  
cKey,UCHAR cMask) ?Nh%!2n  
{ s3+O=5  
 BOOL bAdded=FALSE; gw*d"~A  
 for(int index=0;index<MAX_KEY;index++){ Xl/G|jB9  
  if(hCallWnd[index]==0){ 9wq%Fnt  
   hCallWnd[index]=hWnd; ZM#WdP  
   HotKey[index]=cKey; Pm1 " 0  
   HotKeyMask[index]=cMask; @Qs-A^.  
   bAdded=TRUE; 1=;QWb6  
   KeyCount++; HQ s)T  
   break; Z@[,"{Sn  
  } :>X7(&j8  
 } !%u#J:z2  
 return bAdded; 'd t}i<  
} Y;&#Ur8q  
//删除热键 JA{YdB;il  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^TEODKS  
{ \W}EyA  
 BOOL bRemoved=FALSE; tl)}Be+Dt;  
 for(int index=0;index<MAX_KEY;index++){ Pj.~|5gnf  
  if(hCallWnd[index]==hWnd){ ,#E5/'c`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ oba*w;  
    hCallWnd[index]=NULL; jO,<7FPs5  
    HotKey[index]=0; aydal 9M  
    HotKeyMask[index]=0; WD\{Sdx:r  
    bRemoved=TRUE; 0wkLM-lN  
    KeyCount--; llleo8  
    break; k_a'a)`$6  
   } ob00(?;H  
  } .u*].As=  
 } 'u3+k.  
 return bRemoved; ? w?k-v  
} `{wku@  
;yZ N "r  
+E [bLz^  
  DLL中的钩子函数如下: *(`.h\+  
$0*47+f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Mz G ryM-  
{ &!a 2%%1#N  
 BOOL bProcessed=FALSE; f oVD+\~Y  
 if(HC_ACTION==nCode) m4DH90~a8  
 { *h4m<\^U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Az-!LAu9 R  
   switch(wParam) - X_w&  
   {  6J 5)4^bk  
    case VK_MENU: od}x7RI%m  
     MaskBits&=~ALTBIT; 'YR5i^:t  
     break; w+37'vQ  
    case VK_CONTROL: "<2b jy  
     MaskBits&=~CTRLBIT; {T.Vu]L80  
     break; m6x. "jG  
    case VK_SHIFT: cA%U  
     MaskBits&=~SHIFTBIT; Zd(d]M_x  
     break; 7:L~n(QpP  
    default: //judge the key and send message 668bJ.M\O  
     break; U(N$6{i_  
   } M([H\^\:  
   for(int index=0;index<MAX_KEY;index++){ )/Xrhhx  
    if(hCallWnd[index]==NULL) \!QF9dP4  
     continue; 5lxq-E3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z{g<y^Im+E  
    { Tqa4~|6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9AYe,R  
     bProcessed=TRUE; @c !67Z  
    } L%d?eHF  
   } 12PE{Mut  
  } v,+l xY  
  else if((lParam&0xc000ffff)==1){ //有键按下 h<K;VpL6  
   switch(wParam) N ]7a=  
   { zsXH{atY  
    case VK_MENU: 'r n;|K  
     MaskBits|=ALTBIT; "|'`'W  
     break; w)eQ'6Vu  
    case VK_CONTROL: )t0b$<%  
     MaskBits|=CTRLBIT; Ql@yN@V  
     break; % 9/)  
    case VK_SHIFT: {@ y,  
     MaskBits|=SHIFTBIT; is?&%VY  
     break; _ <a)\UR  
    default: //judge the key and send message I=%sDn  
     break; 4@e!D Du  
   } [T}]Ma*CS  
   for(int index=0;index<MAX_KEY;index++){ /V<`L  
    if(hCallWnd[index]==NULL) tMZ(s  
     continue; $l;tP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  DiQkT R  
    {  GQ0(&I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); % B &?D@  
     bProcessed=TRUE; I*t)x,~3  
    } ~9 WJrRWB  
   } ,Q#tA|:8j  
  } /Z " 4[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 /C"s_:m;3  
   for(int index=0;index<MAX_KEY;index++){ fF>qU-  
    if(hCallWnd[index]==NULL) aaug u.9  
     continue; I!7.fuO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 70 UgKE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !(_xu{(DL  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7 3z Y^ x  
   } 9H}iX0O  
  } A4Q)YY9~  
 } K^vp(2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z){UuiUM+=  
} [a)~Dui0@\  
+R#`j r"  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: SfobzX}~Jh  
8*#][ wC2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]az} n(B,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,L{o, qzC  
kw^Dp[8X  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: @!a]qAt  
D^s0EW-E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;]ShC\1  
{ uP=_-ZUW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) e3={$Ah  
 { O?,i?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 g} ~<!VpX  
  SaveBmp(); 3:8nwt  
  return FALSE; :iQ^1S` pH  
 } fI d)  
 …… //其它处理及默认处理 ,c7u  
} iRwW>a3/  
9h38`*Im;  
:IT U0%;!+  
  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。 d)GkXll1D  
DET!br'z5  
  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。 VtzmY  
!+45=d 5  
  二、编程步骤 Go+xL/f  
3Ra\2(bR  
  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"; @j\?h$A/  
v8vh~^X%P  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ({_:^$E\  
)Kk(P/s  
  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$5nLS2.  
;*4tVp,  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; t6%xit+  
H=o-ScA  
  5、 添加代码,编译运行程序。 \eMYw7y5 M  
8 1K G1i)  
三、程序代码 tD~PvUJ  
>_0 i=.\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Q"6hD?6.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e7bT%h9i  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &^ 3~=$  
#if _MSC_VER > 1000 v_ nBh,2  
#pragma once K!D_PxV  
#endif // _MSC_VER > 1000 `/wq3+?  
#ifndef __AFXWIN_H__ G\:psx/  
#error include 'stdafx.h' before including this file for PCH M*~v'L_sI  
#endif 8/>wgY  
#include "resource.h" // main symbols $>h!J.t  
class CHookApp : public CWinApp rGn5Q V  
{ 28Ssb|  
 public: ;x3 ]4^  
  CHookApp(); J<($L}T*$  
  // Overrides ]~ #+ b>  
  // ClassWizard generated virtual function overrides `^&15?Wk  
  //{{AFX_VIRTUAL(CHookApp) emkMR{MY  
 public: bDZKQ&  
  virtual BOOL InitInstance(); _5U%'\5s  
  virtual int ExitInstance(); >0<KkBH  
  //}}AFX_VIRTUAL Wq{d8|)1  
  //{{AFX_MSG(CHookApp) c6Yf"~TD0  
  // NOTE - the ClassWizard will add and remove member functions here. n<%=~1iY+  
  // DO NOT EDIT what you see in these blocks of generated code ! *t?~)o7  
  //}}AFX_MSG J+cAS/MYX  
  DECLARE_MESSAGE_MAP() {Ukc D+.Y  
}; 4gv.E 0Fo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yYG3/Z3u5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A1|7(Sow  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A^4kYOe  
BOOL InitHotkey(); EBIa%,  
BOOL UnInit(); vNK`Y|u@  
#endif ezg^5o;  
p'Y&Z?8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '?`@7Eol  
#include "stdafx.h" u1pc5 Y{  
#include "hook.h" \=EY@ *=  
#include <windowsx.h> @tE&<[e  
#ifdef _DEBUG Rg8m4xw  
#define new DEBUG_NEW s}[A4`EWH  
#undef THIS_FILE ;o_V!< $  
static char THIS_FILE[] = __FILE__; 43{_Y]  
#endif PQU3s$  
#define MAX_KEY 100 w;yiX<t<  
#define CTRLBIT 0x04 z@Z_] h  
#define ALTBIT 0x02 xq Q~|  
#define SHIFTBIT 0x01 %0+h  
#pragma data_seg("shareddata") <=)D=Ax/_[  
HHOOK hHook =NULL; 3XApY'  
UINT nHookCount =0; \tiUE E|k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g:uvoMUD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT a+YR5*&[OO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey C-a*EG  
static int KeyCount =0; aDN6MZM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift B@"SOX  
#pragma data_seg() kW<Yda<a  
HINSTANCE hins; pBg|n=^  
void VerifyWindow(); b"R, p=M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5#TrCPi6A  
//{{AFX_MSG_MAP(CHookApp) KdOh'OrT9.  
// NOTE - the ClassWizard will add and remove mapping macros here. D0Vyh"ua  
// DO NOT EDIT what you see in these blocks of generated code! H9Y2n 0  
//}}AFX_MSG_MAP e(OwS?K  
END_MESSAGE_MAP() 6m, KL5>W  
Ism^hyL  
CHookApp::CHookApp() S+) l[0  
{ YM #  
 // TODO: add construction code here, Qq,i  
 // Place all significant initialization in InitInstance 6?1s`{yy  
} l)tTg+:  
9*}iBs  
CHookApp theApp; D EUd[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Sk6b`W7$  
{ u( V  
 BOOL bProcessed=FALSE; [K/O5_  
 if(HC_ACTION==nCode) dN$ 1$B^k  
 { a"0B?3*r46  
  if((lParam&0xc0000000)==0xc0000000){// Key up 4 [R8(U[g  
   switch(wParam) RLYU\@kK?  
   { 18DTv6?QG  
    case VK_MENU: M>*0r<qn  
     MaskBits&=~ALTBIT; E;6Y? vJ  
     break; ~w Zl2I  
    case VK_CONTROL: ]dPVtk  
     MaskBits&=~CTRLBIT; 0t#NMW  
     break; ^%\)Xi  
    case VK_SHIFT: W]@gQ (Ef  
     MaskBits&=~SHIFTBIT; 'GEBxNH:  
     break; ;;EDN45  
    default: //judge the key and send message wF|0n t  
     break; Yw$a{5g  
   } {l&Ltruhz  
   for(int index=0;index<MAX_KEY;index++){ l^DINZU@  
    if(hCallWnd[index]==NULL) >.DF"]XM  
     continue; +R|U4`12  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k1ipvKxp:8  
    { {Oy9RES qc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =)(3Dp  
     bProcessed=TRUE; ;]2 x  
    } |ZvNH ~!  
   } Uj4Lu  
  } u~$WH, P3  
  else if((lParam&0xc000ffff)==1){ //Key down pyUNRqp  
   switch(wParam) iBG`43;  
   { 1 L+=|*:  
    case VK_MENU: A)\>#Dv  
     MaskBits|=ALTBIT; ;;ER"N  
     break; "KMLk  
    case VK_CONTROL: jrIA]K6  
     MaskBits|=CTRLBIT; `^v4zWDK  
     break; S304ncS|M  
    case VK_SHIFT: u9TzZ  
     MaskBits|=SHIFTBIT; HG2N-<$  
     break; -'I _*fu  
    default: //judge the key and send message k4S} #!  
     break; l% rx#;=u  
   } p]wP36<S!  
   for(int index=0;index<MAX_KEY;index++) uz]E_&2  
   { :|Z$3q  
    if(hCallWnd[index]==NULL) R;H?gE^m-  
     continue; 1a<]$tZk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J__;.rnk  
    { ykxbX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q^Z~IZ8IT  
     bProcessed=TRUE; 'Pf_5q  
    } LYp'vZ!  
   } Nc{]zWL9  
  } Uh>.v |P6  
  if(!bProcessed){ |r5e{  
   for(int index=0;index<MAX_KEY;index++){ sC% b~  
    if(hCallWnd[index]==NULL) -@rxiC:Q  
     continue; ?Q@L-H`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `'u Umyg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }ppVR$7]0  
   } CV s8s  
  } *i`v~ >  
 } UE^D2u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +AB6lv  
} rFhW^fP/  
3AK(dC[ri  
BOOL InitHotkey() ?$3r5sx  
{ w|=gSC-o  
 if(hHook!=NULL){ N6h1|_o  
  nHookCount++; 6MuWlCKF8  
  return TRUE; (YIhTSL"]  
 } Z)/6??/R  
 else Kaf>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); `8,w[o oC2  
  if(hHook!=NULL) PfyRZ[3)c  
   nHookCount++; fCB:733H  
  return (hHook!=NULL); "ml?7Xl,n  
} Yj) e$f  
BOOL UnInit() Xq|nJ|h  
{ WM/#.  
 if(nHookCount>1){ Mec{_jiH&D  
  nHookCount--; 8 4z6zFv?Q  
  return TRUE; h}avX*Lx_  
 } qtHfz"p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +O'vj  
 if(unhooked==TRUE){ {1~9vHAZ  
  nHookCount=0; \E Z+#3u  
  hHook=NULL; .8]Y-  
 } wy''tqg6  
 return unhooked; ` K w7"  
} Y~az!8j;Z  
kBbl+1{H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Uh.Sc:trA  
{ *wwhZe4V  
 BOOL bAdded=FALSE; v Xb:  
 for(int index=0;index<MAX_KEY;index++){ $&IpX M]  
  if(hCallWnd[index]==0){ z5 Bi=~=#  
   hCallWnd[index]=hWnd; @F?=a*s"!  
   HotKey[index]=cKey; gv9=quG  
   HotKeyMask[index]=cMask; DF'8GF&Rp  
   bAdded=TRUE; nX._EC  
   KeyCount++; 6yI}1g  
   break; 7IW> >RBF  
  } 71O3O7  
 } E:FO_R(Xq  
 return bAdded; 8Y# bN*!  
} %w7m\nw@  
ZW*n /#GUC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JvkL37^ n:  
{ ^n9a " qz  
 BOOL bRemoved=FALSE; W (`c  
 for(int index=0;index<MAX_KEY;index++){ azo0{`S?  
  if(hCallWnd[index]==hWnd){ _R7 w?!t8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J3G7zu8  
    hCallWnd[index]=NULL; _UkmYZ/  
    HotKey[index]=0; ) r9b:c\  
    HotKeyMask[index]=0; o 7G> y#Y  
    bRemoved=TRUE; f jI#-  
    KeyCount--; Wr>(#*r7q  
    break; pCC7(Ouo  
   } h>wcT VF  
  } m"Qq{p|'  
 } ^mg*;8e Ga  
 return bRemoved; [T`}yb@  
} 3sFeP &  
8Mu;U3cIW  
void VerifyWindow() `U{mbw,  
{ BDe]18X  
 for(int i=0;i<MAX_KEY;i++){ #dc1pfL!y{  
  if(hCallWnd!=NULL){ )p8I @E  
   if(!IsWindow(hCallWnd)){ B,_`btJh  
    hCallWnd=NULL; ''S&e  
    HotKey=0; HM&1y ubh#  
    HotKeyMask=0; MdC<4^|  
    KeyCount--; K;U39ofW  
   } TY.FpW  
  } ,=o0BD2q  
 } e7xj_QH  
} bU`=*  
v7IzDz6gF  
BOOL CHookApp::InitInstance() SMoz:J*Q(  
{ $ [7 Vgs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k=/eM$":  
 hins=AfxGetInstanceHandle(); S &JJIFftO  
 InitHotkey(); 3bs4mCq  
 return CWinApp::InitInstance(); 7 ({=*  
} xNpg{cQ=  
Bf]$X>d  
int CHookApp::ExitInstance() ~O;y?]U  
{ hazq#J!  
 VerifyWindow(); Pl+xH%U+?  
 UnInit(); 6:?rlh  
 return CWinApp::ExitInstance(); )"`!AerJ  
} 4:mCXP,x  
|NrrTN?>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0xpx(T[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8g*hvPc  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *7" L]6  
#if _MSC_VER > 1000 4_LQ?U>$  
#pragma once #Qbl=o4  
#endif // _MSC_VER > 1000 '#Dg8/r!  
4/*H.Fl  
class CCaptureDlg : public CDialog ~p*1:ij  
{ Pxhz@":[  
 // Construction z^W$%G  
 public: l#bAl/c`  
  BOOL bTray; 5PZN^\^  
  BOOL bRegistered; 6^#uLp>  
  BOOL RegisterHotkey(); s_eOcm  
  UCHAR cKey; /\=MBUN  
  UCHAR cMask; |}[nH>  
  void DeleteIcon(); |dmh  
  void AddIcon(); u3ZCT" !  
  UINT nCount; DQJG,?e{  
  void SaveBmp(); &mE?y%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ](K0Fwo`;"  
  // Dialog Data LJQ J\bT?  
  //{{AFX_DATA(CCaptureDlg) Cca0](R*&  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8o-bd_  
  CComboBox m_Key; _:J*Cm[q  
  BOOL m_bControl; Z$'I Bv  
  BOOL m_bAlt; ]gEhE  
  BOOL m_bShift; $-vo}k%M  
  CString m_Path; .L;@=Yg )  
  CString m_Number; ,EEPh>cXc  
  //}}AFX_DATA K`k'}(vj  
  // ClassWizard generated virtual function overrides nWWM2v  
  //{{AFX_VIRTUAL(CCaptureDlg) 8`v$liH  
 public: H?yE3 w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Q:MhjkOr}  
 protected: 27 GhE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wW`}VKu  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V"RpH,  
  //}}AFX_VIRTUAL oRq!=eUu_  
  // Implementation |L:Cn J  
 protected: zAScRg$:?  
  HICON m_hIcon; >V;,#5F_  
  // Generated message map functions qv+R:YYOq  
  //{{AFX_MSG(CCaptureDlg) Bjj<\8 ^M  
  virtual BOOL OnInitDialog(); UUtbD&\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4]&<?"LSK  
  afx_msg void OnPaint(); P7GRSjG  
  afx_msg HCURSOR OnQueryDragIcon(); "uD= KlA  
  virtual void OnCancel(); ?o[L7JI  
  afx_msg void OnAbout(); lDc;__}Ws  
  afx_msg void OnBrowse(); . (`3JQ2s  
  afx_msg void OnChange(); lCb+{OB  
 //}}AFX_MSG y79qwM.  
 DECLARE_MESSAGE_MAP() z?ucIsbR  
}; y' xF0  
#endif @q8an  
!3}deY8;#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file '2^ Yw  
#include "stdafx.h" w+AuMc  
#include "Capture.h" dpzw.Z  
#include "CaptureDlg.h" ;IZ?19Q  
#include <windowsx.h> p25Fn`}H  
#pragma comment(lib,"hook.lib") +,flE= 5]s  
#ifdef _DEBUG >+9JD%]x]  
#define new DEBUG_NEW d"T Ht}  
#undef THIS_FILE ;")A{tX2  
static char THIS_FILE[] = __FILE__; J7&DR^.Sw  
#endif Fhj8lVvk  
#define IDM_SHELL WM_USER+1 yA7 )Y})>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5lmO:G1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H\G{3.T.9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &__DJ''+  
class CAboutDlg : public CDialog /"#4T^7&  
{ (ku5WWJ  
 public: ;vp\YIeX1  
  CAboutDlg(); \t.}-u<7{  
  // Dialog Data TEVI'%F  
  //{{AFX_DATA(CAboutDlg) XutF"9u  
  enum { IDD = IDD_ABOUTBOX }; w|Aqqe  
  //}}AFX_DATA Ruaur]  
  // ClassWizard generated virtual function overrides RR|\- 8;  
  //{{AFX_VIRTUAL(CAboutDlg) \54}T 4R  
 protected: YD[H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pSAR/':eg  
  //}}AFX_VIRTUAL xJ(:m<z  
  // Implementation aXR%;]<Dw  
 protected: t[C1z  
  //{{AFX_MSG(CAboutDlg) d'HOpJE  
  //}}AFX_MSG |. C1|J'Z  
  DECLARE_MESSAGE_MAP() %|"Qi]c d  
}; 5cfA;(H  
,4@|1z{bfm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) LAs7>hM  
{ &Cro2|KZhG  
 //{{AFX_DATA_INIT(CAboutDlg) zg}YGu|J  
 //}}AFX_DATA_INIT 1'KishHK=  
} YUkud2,j  
@h9MxCE!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cCdX0@hY  
{ }NmNanW^  
 CDialog::DoDataExchange(pDX); |X(2Zv^O  
 //{{AFX_DATA_MAP(CAboutDlg) /Jlv"R 1,  
 //}}AFX_DATA_MAP ~1(j&&kXet  
} t/p $  
1~5trsB+5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) G$JFuz)|  
 //{{AFX_MSG_MAP(CAboutDlg) Omyt2`q  
 // No message handlers IF_DZ   
 //}}AFX_MSG_MAP \7 a4uc  
END_MESSAGE_MAP() kDsIp=  
Tj`5L6N;8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;+_8&wbqW  
: CDialog(CCaptureDlg::IDD, pParent) JdNF-64ky  
{ "'tRfB   
 //{{AFX_DATA_INIT(CCaptureDlg) UH3t(o7O  
  m_bControl = FALSE; _a'A~JY  
  m_bAlt = FALSE; hU {-a`  
  m_bShift = FALSE; ;5S}~+j  
  m_Path = _T("c:\\"); \C|cp|A*&  
  m_Number = _T("0 picture captured."); lpC @I^:  
  nCount=0; &=q! Wdw~  
  bRegistered=FALSE; _a -]?R  
  bTray=FALSE; IB$7`7  
 //}}AFX_DATA_INIT q~Jq/E"f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SS3-+<z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p+w8$8)  
} Zk`#VH  
tL(BpL'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) T1 MY X  
{ yI8tH!  
 CDialog::DoDataExchange(pDX); Oh!(@  
 //{{AFX_DATA_MAP(CCaptureDlg) PpOlt.yui  
  DDX_Control(pDX, IDC_KEY, m_Key); 5M){!8"S)#  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); NoDZ5Z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0!#; j{JQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >S#ul?  
  DDX_Text(pDX, IDC_PATH, m_Path);  tFh|V pB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); I$jvXl=$  
 //}}AFX_DATA_MAP ijYvqZ_  
} .ER98  
M?@p N<|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) _m'ysCjA  
//{{AFX_MSG_MAP(CCaptureDlg) fE;Q:# Z.  
 ON_WM_SYSCOMMAND() 8A2 z 5Aa  
 ON_WM_PAINT() "> 90E^  
 ON_WM_QUERYDRAGICON() 1/iE`Si  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) cf;Ht^M\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) AtHS@p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Pv){sYUh  
//}}AFX_MSG_MAP j}WByaZ&  
END_MESSAGE_MAP() h4`9Cfrq,  
tYe:z:7l?<  
BOOL CCaptureDlg::OnInitDialog() 'gTmH[be  
{ NPJ.+ph  
 CDialog::OnInitDialog(); (6qsKX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f&I7,"v  
 ASSERT(IDM_ABOUTBOX < 0xF000); @.$MzPQQI  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Y;Y 1+jt  
 if (pSysMenu != NULL) TSto9 $}*  
 { .[j%sGdKl  
  CString strAboutMenu; v'9m7$  
  strAboutMenu.LoadString(IDS_ABOUTBOX); AK/:I>M  
  if (!strAboutMenu.IsEmpty()) wK*PD&nN  
  { ]0 ~qi@  
   pSysMenu->AppendMenu(MF_SEPARATOR); v\A.Tyy  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R@`rT*lJ  
  } Xr_pgW|  
 } 2$0)?ZC?=  
 SetIcon(m_hIcon, TRUE); // Set big icon l4T:d^Eb  
 SetIcon(m_hIcon, FALSE); // Set small icon |E^|X!+9  
 m_Key.SetCurSel(0); /1.rz{wpb  
 RegisterHotkey(); fI:H8  
 CMenu* pMenu=GetSystemMenu(FALSE); b9("DZW;  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \ P/W8{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ; B$ *)X9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O|z%DkH[  
 return TRUE; // return TRUE unless you set the focus to a control |C-y}iQ:6~  
} :5# V^\3*  
>BoSw&T$Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ecFi (eMD  
{ \< 65??P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) H5M#q6`H6  
 { 3H8Al  
  CAboutDlg dlgAbout; )%j"  
  dlgAbout.DoModal(); `XMM1y>V9>  
 } T.Zz;2I  
 else n0fRu`SNV  
 { L;)v&a7[P  
  CDialog::OnSysCommand(nID, lParam);  WL-0(  
 } GU6 qIz|  
} ;Bs^iL  
"tR}j,=S:D  
void CCaptureDlg::OnPaint() X;EJ&g/  
{ |]ucHV  
 if (IsIconic()) )f*Iomp]@  
 { }76.6=~  
  CPaintDC dc(this); // device context for painting kk_zVrQ<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,wK 1=7  
  // Center icon in client rectangle Y!n'" *J>  
  int cxIcon = GetSystemMetrics(SM_CXICON); !J^tg2M8:  
  int cyIcon = GetSystemMetrics(SM_CYICON); *cNk>y  
  CRect rect; 7),*3c')  
  GetClientRect(&rect); GX38~pq  
  int x = (rect.Width() - cxIcon + 1) / 2; 08r[K(bfb,  
  int y = (rect.Height() - cyIcon + 1) / 2; K51fC4'{  
  // Draw the icon RVF F6N^  
  dc.DrawIcon(x, y, m_hIcon); &?T${*~  
 } /hci\-8N~  
 else ?5~!i9pY  
 { s]x2DH+_  
  CDialog::OnPaint(); 9d\N[[Vu]R  
 } L82NP)St  
} x# 8IZ  
;=p;v .l  
HCURSOR CCaptureDlg::OnQueryDragIcon() Sx&mv.?X  
{ :ICr\FY$  
 return (HCURSOR) m_hIcon; gb-tNhJa@b  
} X;]3$\F  
}td6fj_{  
void CCaptureDlg::OnCancel() b]#~39Iph  
{ `A{'s %$?!  
 if(bTray) m+T2vi  
  DeleteIcon(); 065A?KyD  
  CDialog::OnCancel(); cx:jUsb6  
} rWe 8D/oc  
SALCuo"L  
void CCaptureDlg::OnAbout() { _X#fq0}  
{ C yf]`*  
 CAboutDlg dlg; 3@HIpQM3  
 dlg.DoModal(); Xz* tbW#  
} 0UjyMEiK  
Q)dT(Td9~  
void CCaptureDlg::OnBrowse() %kW3hQ<$  
{ qKs7WBRJy  
 CString str; 2'dG7lLu4  
 BROWSEINFO bi; K#)bjxz  
 char name[MAX_PATH]; k4mTZ}6E  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _z%\'(l+  
 bi.hwndOwner=GetSafeHwnd(); GfNWP  
 bi.pszDisplayName=name; {~1M  
 bi.lpszTitle="Select folder"; ? ,V;f2c  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; V*uEJ6T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ee\Gl?VN  
 if(idl==NULL) _w%s(dzk  
  return; I,9~*^$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @`2ozi~lO  
 str.ReleaseBuffer(); VY{,x;O`  
 m_Path=str; nOr"K;C  
 if(str.GetAt(str.GetLength()-1)!='\\') -;S3|  
  m_Path+="\\"; F]SIT\kBm  
 UpdateData(FALSE); 4^BLSK~(  
} %Fm`Y .l  
QvNi8TB  
void CCaptureDlg::SaveBmp() 0k7"H]J  
{ J\GKqt;5@  
 CDC dc; U%Ol^xl  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); jL2MW(d^Q  
 CBitmap bm; T-!|l7V~f  
 int Width=GetSystemMetrics(SM_CXSCREEN); N$ *>suQ,  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4SBLu%=s%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Qv=Bq{N  
 CDC tdc; ?e2Y`0  
 tdc.CreateCompatibleDC(&dc); 7t+]z)  
 CBitmap*pOld=tdc.SelectObject(&bm); t5A[o7BS  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /gF]s_  
 tdc.SelectObject(pOld); BDnBBbBrz  
 BITMAP btm; EyPy*_A  
 bm.GetBitmap(&btm); i&5!9m`Cw  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -KA4Inn]5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +@^47Xu^  
 BITMAPINFOHEADER bih; 14;Av{Xt  
 bih.biBitCount=btm.bmBitsPixel; <WgG=Kf)N  
 bih.biClrImportant=0; 6yi/&#YM  
 bih.biClrUsed=0; :e52hK1[T  
 bih.biCompression=0; -ca]Q|m8  
 bih.biHeight=btm.bmHeight; Wd1 IX^7C%  
 bih.biPlanes=1; tUn&z?7bF  
 bih.biSize=sizeof(BITMAPINFOHEADER); 5 u"nxT   
 bih.biSizeImage=size; v.]'%+::#  
 bih.biWidth=btm.bmWidth; iiQ||P}5  
 bih.biXPelsPerMeter=0; +-",2 d+g  
 bih.biYPelsPerMeter=0; :az!H"4W/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); xQZ MCd  
 static int filecount=0; <vO8_2,V-  
 CString name; 7dsnv)(v  
 name.Format("pict%04d.bmp",filecount++); wsna5D6i  
 name=m_Path+name; 8L@UB6b\  
 BITMAPFILEHEADER bfh; jCam,$oE  
 bfh.bfReserved1=bfh.bfReserved2=0; &<#/&Pq/i  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $)Jc-V 6E  
 bfh.bfSize=54+size; kKNk2!z`M  
 bfh.bfOffBits=54; 7Im}~3NJG  
 CFile bf; h^Arb=I  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e(4bx5 <*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =/M$ <+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zww?  
  bf.WriteHuge(lpData,size); R^F7a0"  
  bf.Close(); !~Ax  
  nCount++;  |UABar b  
 } av7q>NEZ!1  
 GlobalFreePtr(lpData); ~4}*Dhsh  
 if(nCount==1) 5J?bE?X  
  m_Number.Format("%d picture captured.",nCount); )sMAhk|  
 else \>w@=bq26  
  m_Number.Format("%d pictures captured.",nCount); wV]sGHuF}  
  UpdateData(FALSE); hVROzGZk  
} k?z [hZg0  
X*43!\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /QM0.{Ypl  
{ 8Q#t\$RY  
 if(pMsg -> message == WM_KEYDOWN) n">?LN-DC  
 { bEEJVF0  
  if(pMsg -> wParam == VK_ESCAPE) g%Th_=qy  
   return TRUE; qT&S  
  if(pMsg -> wParam == VK_RETURN) _ +0uju?o}  
   return TRUE; eimA *0Cq  
 } pqRO[XEp2  
 return CDialog::PreTranslateMessage(pMsg); v GulM<YY  
} *S,v$ VX  
,S7~=S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eYnLZ&H5O  
{ k4]R]=Fh.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ F&>T-u-dog  
  SaveBmp(); KzxW?Ji$S  
  return FALSE; mkKRC;  
} ZA 99vO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oX%PsS  
 CMenu pop; )< X=z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); PxdJOtI"  
 CMenu*pMenu=pop.GetSubMenu(0); ft*G*.0kO  
 pMenu->SetDefaultItem(ID_EXITICON); >' BU*  
 CPoint pt; iT)2 ?I6!  
 GetCursorPos(&pt); mmh nw (/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q#d+IIR0gK  
 if(id==ID_EXITICON) x`/m>~_  
  DeleteIcon(); a3DoLq"/  
 else if(id==ID_EXIT) W]C_oh  
  OnCancel(); LRfFn^FPM  
 return FALSE; 6x`\ J2x  
} od|N-R  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _Ct@1}aa4x  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [rD+8,zVm  
 AddIcon(); kM6 EZ`mj  
 return res; SF78 s:_!_  
} H >@JfYZ0  
:7 s#5b  
void CCaptureDlg::AddIcon() * wQZ '  
{ q/aL8V<"z  
 NOTIFYICONDATA data; {HE.mHy  
 data.cbSize=sizeof(NOTIFYICONDATA); _KT]l./  
 CString tip; >G w%r1)  
 tip.LoadString(IDS_ICONTIP); CU} q&6h  
 data.hIcon=GetIcon(0); [hvig$L  
 data.hWnd=GetSafeHwnd(); &</ @0  
 strcpy(data.szTip,tip); C {H'  
 data.uCallbackMessage=IDM_SHELL; 3P<Zzt%eT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; JXRmu~W~l  
 data.uID=98; :IOn`mRYu  
 Shell_NotifyIcon(NIM_ADD,&data); x 1 R!  
 ShowWindow(SW_HIDE); :&\E\9  
 bTray=TRUE; `tUeT[  
} ).O\O)K  
#Fb0;H9`  
void CCaptureDlg::DeleteIcon() [|P]St-  
{ %te'J G<  
 NOTIFYICONDATA data; ,<Do ^HB/  
 data.cbSize=sizeof(NOTIFYICONDATA); 2t Z\{=  
 data.hWnd=GetSafeHwnd(); 7J)Hwl  
 data.uID=98; %\s#e  
 Shell_NotifyIcon(NIM_DELETE,&data); tjc5>T[Es8  
 ShowWindow(SW_SHOW); 0B!mEg  
 SetForegroundWindow(); JsoWaD  
 ShowWindow(SW_SHOWNORMAL); s$3eJ|  
 bTray=FALSE; AyI}LQm]u  
} r4z}yt+  
AS/\IHZ\  
void CCaptureDlg::OnChange() ?8aWUgl  
{ R'$ T6FB5  
 RegisterHotkey(); ` wsMybe#  
} tpy :o(H  
ES2d9/]p-  
BOOL CCaptureDlg::RegisterHotkey() ^b/q|(Nu&  
{ - KoA[UJ  
 UpdateData(); o<eWg  
 UCHAR mask=0; x]jdx#'  
 UCHAR key=0; 6iA c@  
 if(m_bControl) 6nhfI\q3wY  
  mask|=4; V~%WKQ  
 if(m_bAlt) bvxxE/?Ni  
  mask|=2; tz \:r>3vI  
 if(m_bShift) ysw6hVb  
  mask|=1; hH@o|!y  
  key=Key_Table[m_Key.GetCurSel()]; E&Zx]?~  
 if(bRegistered){ {)dEO0 p  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !h~#L"z  
  bRegistered=FALSE; ,"lBS?  
 } .ubbNp_LU  
 cMask=mask; ?28G6T]/?d  
 cKey=key;  TVEF+t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2>_LX!kyP]  
 return bRegistered; n4 6PQm%p  
} .4m3@!qo)E  
)]e d;V  
  四、小结 5|B(K @<  
1k70>RQ&69  
  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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