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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: RNB&!NC  
  61kSCu  
  一、实现方法 4_QfM}Fyp  
t.;._'  
  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: =T2SJ)  
aanS^t0  
#pragma data_seg("shareddata") oz=ULPZ%  
HHOOK hHook =NULL; //钩子句柄 O8\f]!O(  
UINT nHookCount =0; //挂接的程序数目 :~"m yn,  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d"-I^|[OM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hizM}d-"C  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8/)\nV$0Y  
static int KeyCount =0; `H:`JBe=+[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 u,8)M' UU  
#pragma data_seg() WIi,`/K+  
`(?c4oq,c>  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 l]zQSXip  
L1!~T+%uQ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Ir>4-@  
s;oe Qa}TB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hv#$Zo<  
cKey,UCHAR cMask) fWEQ vQ  
{ M("sekL  
 BOOL bAdded=FALSE; w#A\(z%;x  
 for(int index=0;index<MAX_KEY;index++){ <CO_JWD  
  if(hCallWnd[index]==0){ l59\Lo:  
   hCallWnd[index]=hWnd; Z9M$*Zp  
   HotKey[index]=cKey; )Hin{~h  
   HotKeyMask[index]=cMask; rMIX{K)'f  
   bAdded=TRUE; [UzacXt  
   KeyCount++; Jb*QlsGd  
   break; %p)&mYK{  
  } -( p%+`  
 } gkxHfm  
 return bAdded; *l =f=  
} F5x*#/af  
//删除热键 (kY  0<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S"G(_%  
{ uQ_C<ii"W  
 BOOL bRemoved=FALSE; s&V sK#  
 for(int index=0;index<MAX_KEY;index++){ 7/hn%obC  
  if(hCallWnd[index]==hWnd){ YL|)`m0-^5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ n5"oXpcIx  
    hCallWnd[index]=NULL; J7",fb  
    HotKey[index]=0; Yu" Q  
    HotKeyMask[index]=0; oCkG  
    bRemoved=TRUE; ].J;8}  
    KeyCount--; Am@Ta "2  
    break; !`Kg&t [&V  
   } tc`3-goX  
  } 4s:M}=]N  
 } *8,W$pe3  
 return bRemoved; B`R@%US  
} 9kWI2cLzQt  
)N- '~<N  
64U|]g d$  
  DLL中的钩子函数如下: !?ZR_=Y%  
FD E?O]^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >i  
{ 3]kM&lK5\  
 BOOL bProcessed=FALSE; 7P(o!%H  
 if(HC_ACTION==nCode) oS%(~])\  
 { 1-^D2B[-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 gd#R7[AVi  
   switch(wParam) +jF |8  
   {   G-1qxK  
    case VK_MENU: p : z ][I  
     MaskBits&=~ALTBIT; #Swc>jYc  
     break; 0!YVRit\N  
    case VK_CONTROL: Hl%Og$q3  
     MaskBits&=~CTRLBIT; fh)eL<I  
     break; E-Xz  
    case VK_SHIFT: *V:U\G  
     MaskBits&=~SHIFTBIT; XZ.D<T"  
     break; iP9]b&  
    default: //judge the key and send message XYP RMa?  
     break; n6Uh%rO7S|  
   } c3l(,5DtH  
   for(int index=0;index<MAX_KEY;index++){ T5}3Y3G,6  
    if(hCallWnd[index]==NULL) E)m \KSwh  
     continue; xV+\R/)x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?K pDEH~\  
    { u{=h%d/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +Eb-|dM  
     bProcessed=TRUE; *LBF+L^C%  
    } B=]L%~xL$  
   } 6P >Y2xV:  
  } (Q||5  
  else if((lParam&0xc000ffff)==1){ //有键按下 ejR$N!LL  
   switch(wParam) +-;v+{  
   { qh6b;ae\x  
    case VK_MENU: r1IvA^X  
     MaskBits|=ALTBIT; *jc >?)k  
     break; ,2Ed^!`  
    case VK_CONTROL: 6<\dQ+~  
     MaskBits|=CTRLBIT; rMJ@oc  
     break; ~.^:?yCA  
    case VK_SHIFT: m=E/um[D  
     MaskBits|=SHIFTBIT; :kI[Pf!z  
     break; X4:84  
    default: //judge the key and send message jbe:"S tw  
     break; JE:LA+ (  
   } |*J;X<Vm  
   for(int index=0;index<MAX_KEY;index++){ GjW(&p$&  
    if(hCallWnd[index]==NULL) <`Fl Igo  
     continue; S6bYd`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <HJLs+C  
    { ^pe/~ :a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8d'/w}GV  
     bProcessed=TRUE; ) C~#W  
    }  Rh6CV  
   } j8e=],sQ  
  } &/^p:I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sV5k@1Y  
   for(int index=0;index<MAX_KEY;index++){ k~<Ozx^AyY  
    if(hCallWnd[index]==NULL) J| &aqY  
     continue; -,/6 Wn'j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) # {k$Fk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l<=k#d  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N4VZl[7?  
   } X(d:!-_m *  
  } emJZ+:%  
 } "dndhoMq  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !X"nN9k  
} aDz% %%:r  
+ah4 K(+3  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 3C=QWw?  
dMjQV&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t4;gY298  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ={o4lFe3v(  
{c?{M.R  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^|h_[>  
2.);OFk+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7?k3jDK  
{ W=S^t_F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^o C>,%7  
 { qrOesSdc  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 j3w~2q"r  
  SaveBmp(); ~IO'"h'w  
  return FALSE; U%1M?vT/  
 } ;A"i.:ZT  
 …… //其它处理及默认处理 q2B'R   
} w H=7pS"s  
b?Q$UMAbH  
w(+ L&IBC  
  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。 ?en-_'}~a  
fOSJdX0e|Q  
  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。 mBrZ{hqS  
h8M}}   
  二、编程步骤 4>Ht_B<<  
;H%'K  
  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"; ,{iMF (Nj  
"\9 beK:l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B "4A1!  
Ls|)SiXrY  
  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; kW%wt1",  
yoq-H+<  
  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;  874j9ky[  
vqUYr  
  5、 添加代码,编译运行程序。 <Cs9$J  
s;Zi   
三、程序代码 ):=8w.yC  
Gyi0SM6v5&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &kWT<*;J)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) M9VAs~&S  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ OHngpe4  
#if _MSC_VER > 1000 g p|G q  
#pragma once V.Lk70 \  
#endif // _MSC_VER > 1000 @Py'SH!-  
#ifndef __AFXWIN_H__ I )% bOK]  
#error include 'stdafx.h' before including this file for PCH [ot+EA  
#endif -ImO y|  
#include "resource.h" // main symbols Bq4@I_b  
class CHookApp : public CWinApp 5D^2 +`$/  
{ W1M Bk[:Q  
 public: ,HE{&p2y  
  CHookApp(); 0Iyb}  
  // Overrides '|tmmoY6a:  
  // ClassWizard generated virtual function overrides Frx_aGLH1  
  //{{AFX_VIRTUAL(CHookApp) :%fnJg(  
 public: SZxnYVY  
  virtual BOOL InitInstance();  HsG3s?*  
  virtual int ExitInstance(); V+})$m*>  
  //}}AFX_VIRTUAL LsMq&a-j2  
  //{{AFX_MSG(CHookApp) WT 5 2  
  // NOTE - the ClassWizard will add and remove member functions here. tC+1 1M  
  // DO NOT EDIT what you see in these blocks of generated code ! "0>AefFd#  
  //}}AFX_MSG 6lr<{k7Nw  
  DECLARE_MESSAGE_MAP() lYm00v6y  
}; ^#h ;bX#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Yv{$XI7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c; 1 f$$>b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'vZWk eo  
BOOL InitHotkey(); |F =.NY  
BOOL UnInit(); 0eA |Uq~  
#endif Fv^>^txh  
qssK0!-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^|h.B$_F,  
#include "stdafx.h" n;.);  
#include "hook.h" 4Dd]:2|D  
#include <windowsx.h> HXB & 6  
#ifdef _DEBUG KpQ@cc  
#define new DEBUG_NEW T}'*Gry  
#undef THIS_FILE ~^3U@( :  
static char THIS_FILE[] = __FILE__; w0.;86<MV  
#endif y?*Y=,"  
#define MAX_KEY 100 '2p,0Bk9i  
#define CTRLBIT 0x04 *'@T+$3s  
#define ALTBIT 0x02 u3 4.   
#define SHIFTBIT 0x01 (x[z=_I%`  
#pragma data_seg("shareddata") )4GCL(&  
HHOOK hHook =NULL; QcdAg%"yy  
UINT nHookCount =0; .g_Kab3?L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >bwq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT py/#h$eY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N71%l  
static int KeyCount =0; k <LFH(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7X/B9Hee  
#pragma data_seg() x)kp*^/  
HINSTANCE hins; YO.+ 06X  
void VerifyWindow(); 99Nm?$ g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `q y@Qo  
//{{AFX_MSG_MAP(CHookApp) Q,o"[ &Gp  
// NOTE - the ClassWizard will add and remove mapping macros here. f Lns^  
// DO NOT EDIT what you see in these blocks of generated code! UtB~joaR  
//}}AFX_MSG_MAP ) @f6  
END_MESSAGE_MAP() SUoUXh^!w  
@ w,O1Xwj  
CHookApp::CHookApp() &X}i%etp^2  
{ N/B-u)?\:  
 // TODO: add construction code here, O 0P4uq  
 // Place all significant initialization in InitInstance QIcc@PGT9a  
} V9D>Xh!0H  
,V+,3TT  
CHookApp theApp; j;&su=p"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {9./-  
{ /yO0Z1G  
 BOOL bProcessed=FALSE; H$3:Ra+ S  
 if(HC_ACTION==nCode) 7Rr +Uzb(  
 { $r(9'm}W  
  if((lParam&0xc0000000)==0xc0000000){// Key up ?$H=n{iW  
   switch(wParam) J}VG4}L  
   { ]n4G]ybK%  
    case VK_MENU: 5mI}IS|@  
     MaskBits&=~ALTBIT; 5&Le?-/\  
     break; >Cglhsb:N  
    case VK_CONTROL: Fau24-g  
     MaskBits&=~CTRLBIT; @aWd0e]  
     break; 8SO(pw9  
    case VK_SHIFT: FlLk.+!t  
     MaskBits&=~SHIFTBIT; t\,X G  
     break; $_W kI^  
    default: //judge the key and send message =i Wn T  
     break; wvEdZGO8!  
   } OGnuBK  
   for(int index=0;index<MAX_KEY;index++){ %Wg8dy|  
    if(hCallWnd[index]==NULL) V.kf@  
     continue; Cfst)[j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SOJkeN  
    { mA\}zLw+r9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ggzcANCD<  
     bProcessed=TRUE; B d?{ldg  
    } 3TnrPO1E  
   } <L<d_  
  } 5wm(gF_t  
  else if((lParam&0xc000ffff)==1){ //Key down 6tBe,'*  
   switch(wParam) u'"]{.K>fb  
   { = _/XFN  
    case VK_MENU: |Y;[)s =q  
     MaskBits|=ALTBIT; >B+!fi'SS>  
     break; B5/"2i  
    case VK_CONTROL: j:'8yFi_  
     MaskBits|=CTRLBIT; 43BqNQ0  
     break; D'\gy$9m1  
    case VK_SHIFT: GNI:k{H@"?  
     MaskBits|=SHIFTBIT; Ou2p^:C(  
     break; 6fw2 ;$x"  
    default: //judge the key and send message Gx h1wqLR  
     break; CdNb&Nyz  
   } e6I7N?j  
   for(int index=0;index<MAX_KEY;index++) o#=O5@>ai  
   { U~Rs?JmTdD  
    if(hCallWnd[index]==NULL) bm-&H   
     continue; %v<BE tq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y3@5~4+  
    { _ v3VUm#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3 V0^v  
     bProcessed=TRUE; ->a |  
    } Ox&]{  
   } 8QFg6#"O  
  } C"g bol^  
  if(!bProcessed){ )cBO_  
   for(int index=0;index<MAX_KEY;index++){ lWk/vj<5  
    if(hCallWnd[index]==NULL) 'DtC=  
     continue; %HcCe[d5l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A$W~R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zEs:OOM  
   } fnJt8Y4  
  } gH|:=vfYUR  
 } YaAOP'p  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )EIT>u=  
} %<^j=K= 0  
A\)~y{9bQ  
BOOL InitHotkey() BKd?%V8:Q  
{ +W}6o3x~  
 if(hHook!=NULL){ VqnM>||  
  nHookCount++; t`E e/L%  
  return TRUE; ?=V;5H.  
 } Z6IWQo,)Rh  
 else DN;3VT.-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); z?'z{+HY  
  if(hHook!=NULL) "g&hsp+i"A  
   nHookCount++; wg]VG,  
  return (hHook!=NULL); Oc%W_Gb7  
} g0:{{w  
BOOL UnInit() zx;~sUR;  
{ Jqz K5)  
 if(nHookCount>1){ P$*9Z@  
  nHookCount--; WSOz^]  
  return TRUE; /G= ?E]^  
 } -qdt$jIM  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 28LYGrB  
 if(unhooked==TRUE){ 1SSS0&  
  nHookCount=0; j. mla  
  hHook=NULL; p|Nh:4iN  
 } ZP9x3MHe  
 return unhooked; +PKd </*]  
} 7,5Bur  
CRPE:7,D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9i+`,r  
{ >IJX=24Rc  
 BOOL bAdded=FALSE; _~O*V&  
 for(int index=0;index<MAX_KEY;index++){ c[a^fu!  
  if(hCallWnd[index]==0){ u Fn?U)  
   hCallWnd[index]=hWnd; /^=8?wK  
   HotKey[index]=cKey; Nf)$K'/  
   HotKeyMask[index]=cMask; K#xL-   
   bAdded=TRUE; 2$FH+wuW  
   KeyCount++; t"jiLOQ[6  
   break; D4$2'h  
  } /o9 0O&  
 } l;}3J3/qq]  
 return bAdded; W}@IUCRs  
} q@vqhE4  
x%T.0@!8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8~ u/gM  
{ f-Zi!AGh>  
 BOOL bRemoved=FALSE; ry0YS\W  
 for(int index=0;index<MAX_KEY;index++){ <"{VVyK  
  if(hCallWnd[index]==hWnd){ }mpFo 2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ BRXDE7vw  
    hCallWnd[index]=NULL; 8~y&"  \  
    HotKey[index]=0; 61](a;Di  
    HotKeyMask[index]=0; iAZbh"I  
    bRemoved=TRUE; sq?js#C5  
    KeyCount--; S ^$!n,  
    break; JJy.)-R  
   } `\J,%J  
  } P=R-1V  
 } zJov*^T-C  
 return bRemoved; `N8t2yF  
} *U +<Hv`C  
jcHyRR1R  
void VerifyWindow() lcK4 Uq\q  
{ 0[E \h   
 for(int i=0;i<MAX_KEY;i++){ ~bsdy2&/q  
  if(hCallWnd!=NULL){ ^G4@cR.An  
   if(!IsWindow(hCallWnd)){ z `jLKPP!=  
    hCallWnd=NULL; 8J:=@X^}  
    HotKey=0; % _nmv  
    HotKeyMask=0; D~n-;T  
    KeyCount--; d .%2QkL  
   } /  QT>"  
  } P=l 7m*m  
 } *P8CzF^>\&  
} /}9)ZY Mx  
)YW"Zo8~!1  
BOOL CHookApp::InitInstance() Wg,7k9I  
{ pfHfw,[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n;wViw  
 hins=AfxGetInstanceHandle(); Q" r y@ (I  
 InitHotkey(); wHh6y?g\  
 return CWinApp::InitInstance(); & H8  %  
} 3n~O&{  
qiH)J- ~GZ  
int CHookApp::ExitInstance() J&&)%&h'I  
{ }42Hhu7j  
 VerifyWindow(); E;wT4 T=  
 UnInit(); ZsSW{ffZ77  
 return CWinApp::ExitInstance(); 2#/23(Wc  
} #x`K4f)  
|AS~sjWSJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b[<L l%K  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /B)2L]6p  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Mfnfp{.)  
#if _MSC_VER > 1000 %+/Dv  
#pragma once r+k&W  
#endif // _MSC_VER > 1000 'x5p ?m  
*W;;L_V"   
class CCaptureDlg : public CDialog &j,# 5f(  
{ cg_ " }]Y1  
 // Construction ~'F.tB  
 public: H3 -?cy  
  BOOL bTray; e=3C*+lq\  
  BOOL bRegistered; ?d+ri  
  BOOL RegisterHotkey(); [5tvdW6Z &  
  UCHAR cKey; A1r%cs  
  UCHAR cMask; e4|a^lS;  
  void DeleteIcon(); R+z'6&/ =I  
  void AddIcon(); xojt s;n   
  UINT nCount; Mdq|: ^px  
  void SaveBmp(); Z_fwvcZ?05  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P^!g0K  
  // Dialog Data ,:2Z6~z{  
  //{{AFX_DATA(CCaptureDlg) 'n=bQ"bQu  
  enum { IDD = IDD_CAPTURE_DIALOG }; $41<ldJ  
  CComboBox m_Key; "?<(-,T  
  BOOL m_bControl; Bh'!aipk  
  BOOL m_bAlt; &xA>(|a\&-  
  BOOL m_bShift; vxOnv8(  
  CString m_Path; (E7"GJ  
  CString m_Number; &nwS7n1eb  
  //}}AFX_DATA l fF RqZ  
  // ClassWizard generated virtual function overrides @,7r<6E  
  //{{AFX_VIRTUAL(CCaptureDlg)  P_'{|M<?  
 public: -v-kFzu  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -%| ] d ;  
 protected: x)Zb:"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JdLPIfI^  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u})*6l.  
  //}}AFX_VIRTUAL mln4Vl(l2M  
  // Implementation WrcmC$ff  
 protected: fj/L)i  
  HICON m_hIcon; @3$I  
  // Generated message map functions  JZ+6)R  
  //{{AFX_MSG(CCaptureDlg) VrLp5?Bh  
  virtual BOOL OnInitDialog(); 'CSjj@3X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _iCrQJ0"T  
  afx_msg void OnPaint(); m5&Ht (I%n  
  afx_msg HCURSOR OnQueryDragIcon(); X)6G :cD  
  virtual void OnCancel(); l0;u$  
  afx_msg void OnAbout(); ]uF7HX7F  
  afx_msg void OnBrowse(); E_I-.o|  
  afx_msg void OnChange(); pJs`/   
 //}}AFX_MSG ITg:OOQ  
 DECLARE_MESSAGE_MAP() ,A $IFE  
}; (F 9P1Iq  
#endif rsa_)iBC  
U;IGV~oT  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $MGKGWx@E  
#include "stdafx.h" S>r}3,]S  
#include "Capture.h" YtKT3u:x  
#include "CaptureDlg.h" pUS:HJk|  
#include <windowsx.h> SvQ|SKE':  
#pragma comment(lib,"hook.lib") SjpCf8Z(  
#ifdef _DEBUG *aC[Tv[-P  
#define new DEBUG_NEW [s`B0V`04  
#undef THIS_FILE QlV(D<  
static char THIS_FILE[] = __FILE__; uD?RL~M  
#endif \At~94  
#define IDM_SHELL WM_USER+1 .ahY 1CO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >N2kWSa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^;h\#S[%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  :\'1x  
class CAboutDlg : public CDialog 1*G&ZI  
{ f0Q! lMv  
 public: AZE%fOG<i  
  CAboutDlg(); )Ute  
  // Dialog Data kr|r-N`  
  //{{AFX_DATA(CAboutDlg) (T$cw(!  
  enum { IDD = IDD_ABOUTBOX }; }yn%_KQ0  
  //}}AFX_DATA gK;dfrU.8Y  
  // ClassWizard generated virtual function overrides qoH:_o8ClO  
  //{{AFX_VIRTUAL(CAboutDlg) {5D%<Te  
 protected: aMGh$\Pg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fa,:d8  
  //}}AFX_VIRTUAL ,jeHL@>w[  
  // Implementation 74:( -vS  
 protected: Te~jYkCd  
  //{{AFX_MSG(CAboutDlg) |f$ws R`&  
  //}}AFX_MSG TTl9xs,nO  
  DECLARE_MESSAGE_MAP() jD"nEp-  
}; p7Zeudmj  
llR5qq=t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )m3emMO2  
{ Q:7P /  
 //{{AFX_DATA_INIT(CAboutDlg) <*z'sUh+}  
 //}}AFX_DATA_INIT A^6z.MdYZ  
} wBg?-ji3<  
F.x7/;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Rf8ZH  
{ IKnf  
 CDialog::DoDataExchange(pDX); CQ<d  
 //{{AFX_DATA_MAP(CAboutDlg) Ye4 &4t  
 //}}AFX_DATA_MAP tDah@_  
} `>g\gaQ  
3BGcDyYE  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dc4XX5Z  
 //{{AFX_MSG_MAP(CAboutDlg) aM1WC 'c&)  
 // No message handlers l{.PyU5)  
 //}}AFX_MSG_MAP *0@Z+'M?  
END_MESSAGE_MAP() jg'"?KSU~  
f. >[ J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T"3LO[j+  
: CDialog(CCaptureDlg::IDD, pParent) bv(+$YR  
{  0%,W5w  
 //{{AFX_DATA_INIT(CCaptureDlg) Fje /;p  
  m_bControl = FALSE; '_Pb\ jK  
  m_bAlt = FALSE; 4clCZ@\K^  
  m_bShift = FALSE; )'g4Ty  
  m_Path = _T("c:\\"); B* 3_m _a  
  m_Number = _T("0 picture captured."); F=5vA v1  
  nCount=0; g\/|7:yB]  
  bRegistered=FALSE; CdCY#$Z  
  bTray=FALSE; +}( ]7du  
 //}}AFX_DATA_INIT |}e"6e%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 35AH|U7b  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); tC$+;_=+F  
} j|o/>^ 'e  
? eI)m  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N4-Y0BO  
{ .Wp(@l'Hd  
 CDialog::DoDataExchange(pDX); | B$JX'_  
 //{{AFX_DATA_MAP(CCaptureDlg) s0vcGh#w  
  DDX_Control(pDX, IDC_KEY, m_Key); ] s 2ec  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DwFvM0O6\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); )>b1%x} =  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5N6R%2,A  
  DDX_Text(pDX, IDC_PATH, m_Path); jt323hHth  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fM:bXR2Y'  
 //}}AFX_DATA_MAP kO^  
} 2,B^OZmw  
Ekrpg^3qp"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W^ask[46R  
//{{AFX_MSG_MAP(CCaptureDlg) o](ORS$~  
 ON_WM_SYSCOMMAND() -V@ST9`  
 ON_WM_PAINT() ^i WGGnGS  
 ON_WM_QUERYDRAGICON() bzZdj6>kX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @q]!C5  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 'cQ`jWZQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) oz:J.<j24Z  
//}}AFX_MSG_MAP _}']h^@ Z  
END_MESSAGE_MAP() Gv8Z  
+|+fDQI  
BOOL CCaptureDlg::OnInitDialog() 0L"uU3  
{ yJqDB$0  
 CDialog::OnInitDialog(); :18}$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hZUS#75M5  
 ASSERT(IDM_ABOUTBOX < 0xF000); jL4"FTcE]3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); RN1KM  
 if (pSysMenu != NULL) #q0xlF@  
 { #\Q)7pgi.  
  CString strAboutMenu; W0U|XX!&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); F/A)2 H_  
  if (!strAboutMenu.IsEmpty()) CnY dj~  
  { ?H!&4o  
   pSysMenu->AppendMenu(MF_SEPARATOR); n Zx^ej\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); T?u*ey~Tv  
  } /Z#AHfKF  
 } 93w$ck},?G  
 SetIcon(m_hIcon, TRUE); // Set big icon O f-gG~  
 SetIcon(m_hIcon, FALSE); // Set small icon C`3fM05g  
 m_Key.SetCurSel(0); ^( C,LVP<  
 RegisterHotkey(); EOqV5$+  
 CMenu* pMenu=GetSystemMenu(FALSE); ji ,`?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >2mY%  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aOoWB^;6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6w{""K.{  
 return TRUE; // return TRUE unless you set the focus to a control :t+Lu H g  
} 5HvYy *B/  
O,J,Q|` H&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ov!L8 9`[u  
{ lu1T+@t  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d]=>U^K  
 { #&{)`+!"  
  CAboutDlg dlgAbout; u6\W"LW  
  dlgAbout.DoModal(); =5%}CbUU)4  
 } s\3ZE11L  
 else P8CIKoKCV  
 { hE2{m{^A  
  CDialog::OnSysCommand(nID, lParam); t `\l+L  
 } o1]1I9  
} 9@Z++J.^y  
?PB}2*R  
void CCaptureDlg::OnPaint() ;Oqbfl#%  
{ 1 EV0Y]T1  
 if (IsIconic()) =E~SaT  
 { <sGioMr  
  CPaintDC dc(this); // device context for painting >6;RTN/P2  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cetlr  
  // Center icon in client rectangle }LZz"b<aw  
  int cxIcon = GetSystemMetrics(SM_CXICON); 1&kf2\S  
  int cyIcon = GetSystemMetrics(SM_CYICON); {`L,F  
  CRect rect; !:g\Fe]  
  GetClientRect(&rect); 1tpt433  
  int x = (rect.Width() - cxIcon + 1) / 2; .N#grk)C  
  int y = (rect.Height() - cyIcon + 1) / 2; zq#gf  
  // Draw the icon ooYs0/,{  
  dc.DrawIcon(x, y, m_hIcon); zfml^N  
 } gp{P _  
 else mA3yM#  
 { P(zquKm  
  CDialog::OnPaint(); y=}a55:qE  
 } 1 7hXg"B  
} 0L7^Vr)  
D4GXZX8 K  
HCURSOR CCaptureDlg::OnQueryDragIcon() D2#.qoP #  
{ =1F F2#zS  
 return (HCURSOR) m_hIcon; ?[O Sy.6  
} l {\@+m  
n 8e}8.Bu  
void CCaptureDlg::OnCancel() 3Q+THg3~?  
{ qSL~A-  
 if(bTray) l)1ySX&BU  
  DeleteIcon(); Nx(y_.I{K  
  CDialog::OnCancel(); f^XfIH_#  
} !r0 z3^*N  
/lvH p  
void CCaptureDlg::OnAbout() TUd=qnu  
{ W}oAgUd  
 CAboutDlg dlg; VoUAFEcs  
 dlg.DoModal(); RK=YFE 0  
} W&a<Q)o*I  
{D&:^f  
void CCaptureDlg::OnBrowse() K:sC6|wG  
{ 1FC 1*7A[  
 CString str; a,p7l$kK  
 BROWSEINFO bi; !1?Nc}T0Q&  
 char name[MAX_PATH]; * @j#13.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nr{ }yQ u  
 bi.hwndOwner=GetSafeHwnd(); O7I|<H/gVE  
 bi.pszDisplayName=name; r|7hm:F)  
 bi.lpszTitle="Select folder"; rwdj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; D'Sdz\:4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #EU x1II  
 if(idl==NULL) /F @a@m|  
  return; Ucok&)7-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1hgmlY`  
 str.ReleaseBuffer(); UbV} !  
 m_Path=str; B bx.RL.V  
 if(str.GetAt(str.GetLength()-1)!='\\') t) ~v5vr  
  m_Path+="\\"; E|^~R}z)  
 UpdateData(FALSE); 1 Xu^pc  
} +xtR`Y"  
s|&2QG0'7  
void CCaptureDlg::SaveBmp() mh`VZQ@  
{ v~>4c<eG  
 CDC dc; &+t,fwlM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >@d=\Kyu  
 CBitmap bm; 3&JsYQu  
 int Width=GetSystemMetrics(SM_CXSCREEN); K29KS)~;W  
 int Height=GetSystemMetrics(SM_CYSCREEN); Ib8xvzR6I&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); g8w5X!Z  
 CDC tdc; BI6o@d;=4  
 tdc.CreateCompatibleDC(&dc); ?en%m|}0  
 CBitmap*pOld=tdc.SelectObject(&bm); <:BhV82l  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +#y[sKa  
 tdc.SelectObject(pOld); E>?T<!r~j  
 BITMAP btm; Tp/+{|~  
 bm.GetBitmap(&btm); iPJZ%  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s?*MZC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %@jv\J  
 BITMAPINFOHEADER bih; 8aD4 wc  
 bih.biBitCount=btm.bmBitsPixel; `ja**re  
 bih.biClrImportant=0; "-TIao#  
 bih.biClrUsed=0; fXYg %  
 bih.biCompression=0; a4! AvG  
 bih.biHeight=btm.bmHeight; Em R#)c~(W  
 bih.biPlanes=1; ? <slB>8  
 bih.biSize=sizeof(BITMAPINFOHEADER); e&u HU8k*  
 bih.biSizeImage=size; %+9Mr ami  
 bih.biWidth=btm.bmWidth; 8ESBui3;  
 bih.biXPelsPerMeter=0; pOip$Z  
 bih.biYPelsPerMeter=0; [0} ^w[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,saf"Ed=  
 static int filecount=0; N|h}'p  
 CString name; =`rESb[  
 name.Format("pict%04d.bmp",filecount++); d&0^AvM@  
 name=m_Path+name; ^@`dsll  
 BITMAPFILEHEADER bfh; HtIM8z#/  
 bfh.bfReserved1=bfh.bfReserved2=0; . \fzK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p]#%e0  
 bfh.bfSize=54+size; {j E}mzi  
 bfh.bfOffBits=54; B;':Eaa@  
 CFile bf; R '/Ilz`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E7axINca  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ([ xYOxcp5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W%.Kr-[?`o  
  bf.WriteHuge(lpData,size); ^r$P&}Z\b  
  bf.Close(); mi3yiR  
  nCount++; ;^FV  
 } pUr.<yc&u  
 GlobalFreePtr(lpData); TP oP%Yj"  
 if(nCount==1) -$4PY,  
  m_Number.Format("%d picture captured.",nCount); F,`y_71<  
 else qgU$0enSs  
  m_Number.Format("%d pictures captured.",nCount); o$YL\ <qp  
  UpdateData(FALSE); 3%xj-7z W  
} SVaC)O(  
hM(|d@)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >+fet ,  
{ ?!~CX`eMZ  
 if(pMsg -> message == WM_KEYDOWN) (Y!@,rKd   
 { ( _E<?  
  if(pMsg -> wParam == VK_ESCAPE) #f~#38_  
   return TRUE; U w][U  
  if(pMsg -> wParam == VK_RETURN) Ohnd:8E  
   return TRUE; T.aY {Y  
 } h5ST`jZ  
 return CDialog::PreTranslateMessage(pMsg); aBT|Q@Y.  
} \=4[v-3 H  
p}}o#a~V),  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) icHc!m?  
{ 4RNB\D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Hc4]2pf  
  SaveBmp(); cyG3le& +G  
  return FALSE; {v56k8uZ  
} }0|,*BkI m  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ KyNv)=x4c  
 CMenu pop; \ M8;CN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }ruBbeQ  
 CMenu*pMenu=pop.GetSubMenu(0); x2[A(O=  
 pMenu->SetDefaultItem(ID_EXITICON); B9n$8QS  
 CPoint pt; _bn*B$  
 GetCursorPos(&pt); ,)nO   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PygaW&9Z|d  
 if(id==ID_EXITICON) M"#xjP.  
  DeleteIcon(); 9dr\=e6) C  
 else if(id==ID_EXIT) z'MOuz~Y  
  OnCancel(); u:3~Ius  
 return FALSE; zVYX#- nv  
} 0S;H`w_S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); INE8@}e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -Yy,L%E]F:  
 AddIcon(); X4lz?Y:*  
 return res; TP[<u-@G  
} ! iA0u  
Q\Fgc ;.U  
void CCaptureDlg::AddIcon() \;}F6g  
{ )&<BQIv9/  
 NOTIFYICONDATA data; vu;pILN  
 data.cbSize=sizeof(NOTIFYICONDATA); NB;8 e>8  
 CString tip; noC ]&4b  
 tip.LoadString(IDS_ICONTIP); E=3<F_3W  
 data.hIcon=GetIcon(0); )VID ;l;4  
 data.hWnd=GetSafeHwnd(); B_anO{3$4  
 strcpy(data.szTip,tip); &%}6&PW i  
 data.uCallbackMessage=IDM_SHELL; iZB?5|*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ogH{   
 data.uID=98; 3VbMW,_&"  
 Shell_NotifyIcon(NIM_ADD,&data); gN Xg  
 ShowWindow(SW_HIDE); b'4{l[3~nl  
 bTray=TRUE; 0p :FAvvNI  
} Ua)ARi %  
B)O{+avu  
void CCaptureDlg::DeleteIcon() (hS j4Cp  
{ Tf) qd\  
 NOTIFYICONDATA data; K 38e,O  
 data.cbSize=sizeof(NOTIFYICONDATA); G< l+94(  
 data.hWnd=GetSafeHwnd(); Jc"xH~,  
 data.uID=98; N2vSJ\u  
 Shell_NotifyIcon(NIM_DELETE,&data); kqYWa`eE  
 ShowWindow(SW_SHOW); BYFvf(>  
 SetForegroundWindow(); >uN{cohs  
 ShowWindow(SW_SHOWNORMAL); [nB[]j<R*  
 bTray=FALSE; ^+^#KC8]W  
} i<l_z&  
>}%  
void CCaptureDlg::OnChange() j{U?kW{o  
{ 9`81br+~  
 RegisterHotkey(); R$IxR=hMx  
} '.r_6X$7Jt  
<spVUp  
BOOL CCaptureDlg::RegisterHotkey() u+a" '*  
{ N?TXPY  
 UpdateData(); lO! Yl:;m%  
 UCHAR mask=0; ]*|+06  
 UCHAR key=0; (B{`In8G>y  
 if(m_bControl) \C $LjSS-  
  mask|=4; oOlqlv  
 if(m_bAlt) z'Atw"kA  
  mask|=2; t<wjS|4  
 if(m_bShift) (-viP  
  mask|=1; W+d=BnOa8  
  key=Key_Table[m_Key.GetCurSel()]; SK t&]H  
 if(bRegistered){ DJvmwFx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]1h W/!  
  bRegistered=FALSE; "`qmeZ$rg  
 } uT:'Kkb!  
 cMask=mask; :jlKj}4A  
 cKey=key; 3oc p4x`[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); E1IT>_  
 return bRegistered; L& ucTc =  
} 7ESSx"^B  
F_.rLgGY  
  四、小结 CT,PQ  
Yl4XgjG  
  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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