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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: 8tv4_Lbx  
  X 5}=|%Y  
  一、实现方法 uqI'e_&=&5  
6bjZW ~  
  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: <& +jl($"  
-~xQ@+./  
#pragma data_seg("shareddata") #6YpV)  
HHOOK hHook =NULL; //钩子句柄 Hf1b&8&:K  
UINT nHookCount =0; //挂接的程序数目 f_LXp$n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \<xo`2b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )16+Pm8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5Uy *^C7M^  
static int KeyCount =0; us1$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <"`f!k#[  
#pragma data_seg() Ci 4c8  
Qx|HvT2P  
  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。 toPFkc6`  
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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: {` bX*]  
BQ[R)o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `W_&^>yl  
cKey,UCHAR cMask) 9ei'oZ  
{ !ii( 2U  
 BOOL bAdded=FALSE; \}kR'l  
 for(int index=0;index<MAX_KEY;index++){ n{~&^Nby*I  
  if(hCallWnd[index]==0){ {jR3D!hK  
   hCallWnd[index]=hWnd; <3N\OV2  
   HotKey[index]=cKey; j x< <h _j  
   HotKeyMask[index]=cMask; G,P k3>I'  
   bAdded=TRUE; *\}$,/m['  
   KeyCount++; 6|n3Q$p  
   break; sGNHA( ;  
  } vRW;{,d  
 } ?6ssSjR}  
 return bAdded; ;w]1H&mc*A  
} 9eP*N(m<  
//删除热键 EXH,+3fQp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {E)tzBI;^  
{ }QQl.'  
 BOOL bRemoved=FALSE; lH/" 47  
 for(int index=0;index<MAX_KEY;index++){ [N%InsA9k  
  if(hCallWnd[index]==hWnd){ Ez-AQ'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;g+fY 6  
    hCallWnd[index]=NULL; 0LzS #J+  
    HotKey[index]=0; Iix:Y}  
    HotKeyMask[index]=0; . uGne  
    bRemoved=TRUE; ,\3Cq2h  
    KeyCount--; Qh Rj*,  
    break; <6hs<qXqi  
   } nTs\zikP  
  } g[@0H=  
 } Ge?DD,a c  
 return bRemoved; Gx4uf  
} B%tj-h(a  
R8!~>$#C6)  
Gf.xr%mUZr  
  DLL中的钩子函数如下: nZL!}3@<  
]c 'EJu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ']c;$wP  
{ ;QCGl$8A  
 BOOL bProcessed=FALSE; =u0a/2u|  
 if(HC_ACTION==nCode) &,Loqr  
 { [J eq ?X9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5S&Qj7kr  
   switch(wParam) !nsr( 7X2  
   {  32anmVnf  
    case VK_MENU: Q;=4']hYU  
     MaskBits&=~ALTBIT; [9~EH8  
     break; =x(k)RTDu  
    case VK_CONTROL: ^c.pvC"4j  
     MaskBits&=~CTRLBIT; fMW=ss^fu-  
     break; d_Zj W  
    case VK_SHIFT: s-x1<+E(  
     MaskBits&=~SHIFTBIT; -H[@]Q4w  
     break; R\5fl[  
    default: //judge the key and send message 67}8EV!/k  
     break; + >:}   
   } a5pM~.]  
   for(int index=0;index<MAX_KEY;index++){ Pjvb}q=  
    if(hCallWnd[index]==NULL) rij%l+%@#  
     continue; ~mah.8G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F/tRyq`D  
    { Wie0r@5E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V8o, e  
     bProcessed=TRUE; {IBbN05 ;  
    } 5RO6YxQ  
   } J &=5h.G$  
  } D?* du#6  
  else if((lParam&0xc000ffff)==1){ //有键按下 sH1 ucZ>9Y  
   switch(wParam) g%m-*v*  
   { XPt>klf  
    case VK_MENU: Q($@{[lT  
     MaskBits|=ALTBIT; 3]'h(C  
     break; ErsJWp  
    case VK_CONTROL: :(3'"^_NA  
     MaskBits|=CTRLBIT; &n83>Q  
     break; RCK*?\m5  
    case VK_SHIFT: Y}yh6r;i  
     MaskBits|=SHIFTBIT; 3w[uc~f  
     break; |@R/JGB^  
    default: //judge the key and send message 8/,s 8u  
     break; } MP_  
   } \fUVWXv  
   for(int index=0;index<MAX_KEY;index++){ B"*PBJuOA  
    if(hCallWnd[index]==NULL) -H_#et3&i  
     continue; k!+v*+R+V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +[S<"}ls7  
    { #Ak9f-pf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |6Iw\YU  
     bProcessed=TRUE; G2c\"[N1/  
    } o ?.VW/"  
   } XJS^{=/  
  } _wW"Tn]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $mf6!p4  
   for(int index=0;index<MAX_KEY;index++){ ci 22fw0  
    if(hCallWnd[index]==NULL) !@ AnwV]  
     continue; F<2gM#jLB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O0pXHXSAL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k#mL4$]V5N  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 56NDU>j$  
   } 7s:cg  
  } bsI?=lO  
 } YVz,P_\(m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); { M[iYFg=  
} B4m34)EOE  
=PjdL3 2  
  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: R \y qM;2  
S!JLy&@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7vGAuTfi/@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  @_WZZ  
md : Wx  
  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: DC$> 5FDv  
U}<zn+SI#V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "zFTPL"  
{ y{tM|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &oK&vgcj  
 { jcxeXp|00  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $O\]cQD`u  
  SaveBmp(); N#:W#C{16w  
  return FALSE; sN1I+X  
 } poi39B/Vt  
 …… //其它处理及默认处理 /" &Jf}r  
} \C1`F [d_  
V`feUFw3  
i(q a'*  
  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。 O G7U+d6  
9Z3Y,`R,  
  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。 =}SC .E\  
H3ob 8+J  
  二、编程步骤 j(_6.zf  
@_;vE(!5  
  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"; JVPLE*T  
OF! n}.O(  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :pP l|"  
7Uh/Gl  
  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; D;DI8.4`N  
]XfROhgP=  
  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; *  }ZKQ  
3.?oG5 P#  
  5、 添加代码,编译运行程序。 6ZGw 3p)  
5@i(pVWZ  
三、程序代码 eGbjk~,f'  
pr1>:0dg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (xBWxeL~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k]A$?C0Q<%  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ {r?Ly15  
#if _MSC_VER > 1000 Bjb8#n04  
#pragma once BUla2p  
#endif // _MSC_VER > 1000 *{e,< DV  
#ifndef __AFXWIN_H__ :YmFQ>e?  
#error include 'stdafx.h' before including this file for PCH "/\- ?YJjw  
#endif Novn#0a  
#include "resource.h" // main symbols $n<X'7@0  
class CHookApp : public CWinApp z'Fu} ho  
{ `ItPTSOi  
 public: 'd<1;Ayw  
  CHookApp(); FK,YVY  
  // Overrides M >s,I^  
  // ClassWizard generated virtual function overrides /JP%gD"8  
  //{{AFX_VIRTUAL(CHookApp) Ar[$%  
 public: %h=cwT6  
  virtual BOOL InitInstance(); P# Z+:T  
  virtual int ExitInstance(); cbX  <  
  //}}AFX_VIRTUAL KMV&c  
  //{{AFX_MSG(CHookApp) >=L<3W1  
  // NOTE - the ClassWizard will add and remove member functions here. a0B,[i  
  // DO NOT EDIT what you see in these blocks of generated code ! gG,gL 9o  
  //}}AFX_MSG  'v&f  
  DECLARE_MESSAGE_MAP() ]y/!GFQ  
}; {UOR_Vt!*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); =>)4>WT8A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )^Md ^\?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /2]=.bLwz  
BOOL InitHotkey(); :x_;-  
BOOL UnInit(); Lq5Eu$;r  
#endif zT _[pa)O`  
{ Em fw9L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4jz2x #T  
#include "stdafx.h" X>s'_F?  
#include "hook.h" aK'%E3!~=x  
#include <windowsx.h> 8$6^S{M3  
#ifdef _DEBUG xz vbjS W  
#define new DEBUG_NEW vA@\V)s  
#undef THIS_FILE EY.Z.gMZI(  
static char THIS_FILE[] = __FILE__; P&8QKX3 j^  
#endif #,\qjY  
#define MAX_KEY 100 4-\gha  
#define CTRLBIT 0x04 vsCy?  
#define ALTBIT 0x02 @:G#[>nKe  
#define SHIFTBIT 0x01 L]Dl}z  
#pragma data_seg("shareddata") 7T9Mo .  
HHOOK hHook =NULL; 9uA2M!~i2  
UINT nHookCount =0; Zd[6-/-:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4.i< `'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT WH0$v#8`v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey . ^JsnP  
static int KeyCount =0; *bTR0U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `1U?^9Nf  
#pragma data_seg() DTSK*a`  
HINSTANCE hins; CXhE+oS5z'  
void VerifyWindow(); 4qLH3I[Y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) pksF| VS  
//{{AFX_MSG_MAP(CHookApp) )\Ay4 d  
// NOTE - the ClassWizard will add and remove mapping macros here. JnZlz?}^  
// DO NOT EDIT what you see in these blocks of generated code! pe7R1{2Q_s  
//}}AFX_MSG_MAP DM)%=C6<  
END_MESSAGE_MAP() hG%J:}  
}SF<. A  
CHookApp::CHookApp() c/ABBvd|  
{ %oN5jt  
 // TODO: add construction code here, m}>#s3KPA  
 // Place all significant initialization in InitInstance zD}2Zh]  
} D= LLm$y  
[(4s\c  
CHookApp theApp; 58.b@@T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) , aQ{  
{ ~OQ/ |ws  
 BOOL bProcessed=FALSE; (cEjC`]  
 if(HC_ACTION==nCode) QGQ}I  
 { uf&Ke k,  
  if((lParam&0xc0000000)==0xc0000000){// Key up K trR+ :  
   switch(wParam) 0 P-eC|0  
   { I2<t?c:Pn<  
    case VK_MENU: 0!!z'm3  
     MaskBits&=~ALTBIT; >`!Lh`n7_  
     break; (}NKW  
    case VK_CONTROL: r1QLSD]i6  
     MaskBits&=~CTRLBIT; 8 ,<F102(  
     break; ;Jq 7E  
    case VK_SHIFT: xHY#"   
     MaskBits&=~SHIFTBIT; 1 n<7YO7}  
     break; 8<Yqpb  
    default: //judge the key and send message HOrD20  
     break; nq"U`z@R  
   } 2YL)" w  
   for(int index=0;index<MAX_KEY;index++){ 2W 9N-t2 1  
    if(hCallWnd[index]==NULL) fu6Ir,  
     continue; 57eA (uI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5 U{}A\q  
    { 12MWO_'g8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MehMhHY  
     bProcessed=TRUE; vpl> 5%  
    } 3BWYSJ|  
   } y7)$~R):-  
  } yw9)^JU8"  
  else if((lParam&0xc000ffff)==1){ //Key down z&r@c-l@  
   switch(wParam) ES&"zjr$  
   { *D$[@-7  
    case VK_MENU: mUW4d3tE  
     MaskBits|=ALTBIT; 9 EqU 2~  
     break; 1:r8p6  
    case VK_CONTROL: P7`sJ("#  
     MaskBits|=CTRLBIT; kX)Xo`^Ys  
     break; 2PrUI;J$  
    case VK_SHIFT: l;C00ZBOc  
     MaskBits|=SHIFTBIT; &6mXsx$  
     break; M@b:~mI[sw  
    default: //judge the key and send message J$X{4  
     break; {"x8 q  
   } +vh 4I  
   for(int index=0;index<MAX_KEY;index++) o> i`Jq&  
   { bW9a_myE  
    if(hCallWnd[index]==NULL) ySk'#\d  
     continue; > R5<D'cEN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :6r)HJ5sg  
    { Ckc4U. t|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AvS<b3EoN  
     bProcessed=TRUE; k&h3"  
    } }pzUHl>  
   } =5jng.  
  } ?UGA-^E1  
  if(!bProcessed){ bdUe,2Yin  
   for(int index=0;index<MAX_KEY;index++){ $ 3/G)/A  
    if(hCallWnd[index]==NULL) .+ w#n<  
     continue; |6d0,muN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R;68C6 4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U:n3V  
   } KPcOW#.T  
  } e MT5bn  
 } @ !UuK;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); >w~Hq9  
} nA#FGfZ{Ge  
g_l=z`,8  
BOOL InitHotkey() ~j&#DG&L  
{  *Fe  
 if(hHook!=NULL){ ~ojH$=K>d  
  nHookCount++; D|`I"N[<  
  return TRUE; 7;T6hKWV[  
 } J XKqQxZ[X  
 else  ta\CZp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r#xq 8H=_m  
  if(hHook!=NULL) T3W?-,  
   nHookCount++; L&WhX3$u  
  return (hHook!=NULL); p*_^JU(<p  
} ^-yEb\\i  
BOOL UnInit() 9 J0JSy  
{ dfss_}R  
 if(nHookCount>1){ 4._ U  
  nHookCount--; pW>?%ft.  
  return TRUE; cR0OJ'w  
 } ph;ds+b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b;X|[tB  
 if(unhooked==TRUE){ )S;pYVVAl  
  nHookCount=0; l".LtUf-  
  hHook=NULL; 2!u4nxZ.  
 } l*`2 EJ  
 return unhooked; MY[QYBkn}  
} ,'E+f%  
Sl?@c/Ng  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m1mA:R\zM  
{ #BK3CD(&  
 BOOL bAdded=FALSE; 7vRFF@eq}  
 for(int index=0;index<MAX_KEY;index++){ t3dvHU&Z:  
  if(hCallWnd[index]==0){ !G0OD$  
   hCallWnd[index]=hWnd; Sas &P:# r  
   HotKey[index]=cKey; $i^#KZ}-WK  
   HotKeyMask[index]=cMask; 2th>+M~A  
   bAdded=TRUE; M :4N'#`  
   KeyCount++; W.fsW<{4j  
   break; 1I{^]]qw  
  } B`Q~p 92  
 } z)Is:LhS  
 return bAdded; BO3#*J5S\  
} |V 3AA   
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BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Dp5hr8bT  
{ _qZ?|;o^  
 BOOL bRemoved=FALSE; HFr#Ql>g  
 for(int index=0;index<MAX_KEY;index++){ =Qa*-*  
  if(hCallWnd[index]==hWnd){ %SHjJCS3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yt+"\d  
    hCallWnd[index]=NULL; )_vE"ryThA  
    HotKey[index]=0; 7 fE QD?C  
    HotKeyMask[index]=0; a2{ nrGD  
    bRemoved=TRUE; phT|w H  
    KeyCount--; /:YJ2AARY  
    break; 9 2e?v8  
   } Od?M4Ed(  
  } Hkcr+BQ  
 } w A0 $d  
 return bRemoved; kFJ sB,2-  
} 7~2/NU?  
Zr&~gXmVS  
void VerifyWindow() jP]I>Tq  
{ 3kl<~O|Fs  
 for(int i=0;i<MAX_KEY;i++){ f^tCD'Vmi  
  if(hCallWnd!=NULL){ rM sd)  
   if(!IsWindow(hCallWnd)){ [%8t~zg  
    hCallWnd=NULL; V8aLPJ0_  
    HotKey=0; ((2 g  
    HotKeyMask=0; NaR/IsN8%  
    KeyCount--; 8op,;Z7Y  
   } 3M;[.b  
  } FXHcy:)}G  
 } {Q&@vbw'  
} ,r&:C48 dI  
Eagl7'x  
BOOL CHookApp::InitInstance() >O{[w'sWa  
{ 7lo`)3mB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^^ Q'AE  
 hins=AfxGetInstanceHandle(); \Kx@?,  
 InitHotkey(); &I&:  
 return CWinApp::InitInstance(); Ac0^`  
} 9rB,7%@EL  
AjTkQ)  
int CHookApp::ExitInstance() Lq&;`)BJ  
{ `W3;LTPEb  
 VerifyWindow(); S690Y]:h$v  
 UnInit(); h\jV@g$  
 return CWinApp::ExitInstance(); wTpjM@F?J|  
} * 5H  
/``4!jU  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [>B`"nyNQ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) DE{tpN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Kc6p||<  
#if _MSC_VER > 1000 2WP73:'t  
#pragma once i.|zKjF'  
#endif // _MSC_VER > 1000 rQ^X3J*`  
y?ps+ce93  
class CCaptureDlg : public CDialog OZ/P@`kN.f  
{ Pl@3=s!~>~  
 // Construction :GXD-6}^|  
 public: (BB&ZUdyv  
  BOOL bTray; KxEy N(n  
  BOOL bRegistered; Px!M^ T!Pi  
  BOOL RegisterHotkey(); D!K){ E  
  UCHAR cKey; ;3nR_6\  
  UCHAR cMask; q'07  
  void DeleteIcon(); )zFPf]gz  
  void AddIcon(); &8l"Dl  
  UINT nCount; n/ \{}9   
  void SaveBmp(); F__(iXxC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9]ga\>v  
  // Dialog Data (8[etm  
  //{{AFX_DATA(CCaptureDlg) ;*3OkNxa3  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?0v(_ v  
  CComboBox m_Key; `)9nBZ  
  BOOL m_bControl; 4K_fN  
  BOOL m_bAlt; tWs ]Zd  
  BOOL m_bShift; tD G[}j  
  CString m_Path; 6#,VnS)`q  
  CString m_Number; 4CzT<cp  
  //}}AFX_DATA E3pnu.;U:_  
  // ClassWizard generated virtual function overrides m&GxL T6  
  //{{AFX_VIRTUAL(CCaptureDlg) (<= &#e?  
 public: .RI{\i`  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j k%MP6  
 protected: j{.P'5e@pZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $VWeo#b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J>I.|@W4  
  //}}AFX_VIRTUAL j}0W|*  
  // Implementation SR,id B&i  
 protected: X*Ibk-PUM  
  HICON m_hIcon; Ig9gGI,  
  // Generated message map functions SDdefB  
  //{{AFX_MSG(CCaptureDlg) *rY@(|  
  virtual BOOL OnInitDialog(); E]^wsS>=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); cULASS`,  
  afx_msg void OnPaint(); 6`KAl rH  
  afx_msg HCURSOR OnQueryDragIcon(); [D]9M"L,vQ  
  virtual void OnCancel(); HFJna2B`  
  afx_msg void OnAbout(); 3DNw=Ic0k  
  afx_msg void OnBrowse(); eYQq@lrWv  
  afx_msg void OnChange(); ~Rs_ep'+Q2  
 //}}AFX_MSG rf2+~B{$,  
 DECLARE_MESSAGE_MAP() y7K&@ Y  
};  _\H MF  
#endif 8\z5*IPGs  
K$S:V=y%r7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 8Ol#-2>k$  
#include "stdafx.h" 5t` :=@u  
#include "Capture.h" Pj4WWKX  
#include "CaptureDlg.h" -&PiD  
#include <windowsx.h> *z2G(Uac  
#pragma comment(lib,"hook.lib") h0YIPB  
#ifdef _DEBUG o"O=Epg  
#define new DEBUG_NEW bITc9Hqc  
#undef THIS_FILE N5 BC<pu  
static char THIS_FILE[] = __FILE__; `m6>r9:  
#endif ZRDY `eK  
#define IDM_SHELL WM_USER+1 0KW@j>=jK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zJp}JO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1_D|;/aI  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; QZcdfJck=+  
class CAboutDlg : public CDialog GpjyF_L  
{ %/l9$>{  
 public: B8+J0jdg6%  
  CAboutDlg(); q Ee1OB  
  // Dialog Data 8.-0_C*U;  
  //{{AFX_DATA(CAboutDlg) w\ hl2JTy  
  enum { IDD = IDD_ABOUTBOX }; OYw~I.Rq  
  //}}AFX_DATA 4!'1o`8vs  
  // ClassWizard generated virtual function overrides c7$L:  
  //{{AFX_VIRTUAL(CAboutDlg) $T\W'W R>  
 protected: [@!.(Hp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D& Xh|}2A  
  //}}AFX_VIRTUAL q[6tvPfkX  
  // Implementation _ >)+ u  
 protected: P\;L#2n  
  //{{AFX_MSG(CAboutDlg) L5%t.7B  
  //}}AFX_MSG 7H$0NMP  
  DECLARE_MESSAGE_MAP() TU6e,G|t  
}; ^;";fr Vw  
4)L(41h  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nXgnlb=  
{ Vy]y73~  
 //{{AFX_DATA_INIT(CAboutDlg) +T*=JHOD  
 //}}AFX_DATA_INIT /S32)=(  
} 'j^A87\M_  
up[9L|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uFseO9F.2  
{ \)\uAI-  
 CDialog::DoDataExchange(pDX); e):jQite   
 //{{AFX_DATA_MAP(CAboutDlg) mWOW39Ku  
 //}}AFX_DATA_MAP  %2 A-u  
} i$~2pr  
iV h^;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) "m*.kB)e7  
 //{{AFX_MSG_MAP(CAboutDlg) \;al@yC=T  
 // No message handlers r)ni;aP  
 //}}AFX_MSG_MAP cL31g_u  
END_MESSAGE_MAP() XCCh*qym  
m3Mo2};?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8(yZX4OH>  
: CDialog(CCaptureDlg::IDD, pParent) hu?Q,[+o  
{ g"k1O  
 //{{AFX_DATA_INIT(CCaptureDlg) 8>T#sO?+  
  m_bControl = FALSE; +D[|Mi  
  m_bAlt = FALSE; |eN#9Bm  
  m_bShift = FALSE; 5a$Q}!6E.Y  
  m_Path = _T("c:\\"); X9W'.s.[Q  
  m_Number = _T("0 picture captured."); gZa/?[+  
  nCount=0; ~7!=<MW  
  bRegistered=FALSE; \!!qzrq  
  bTray=FALSE; QucDIZ  
 //}}AFX_DATA_INIT |Z]KF>S]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L-B"P&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xvP=i/SO  
}  ]/l"  
"Di27Rq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !Tc jJ2T  
{ ~d0:>8zQR  
 CDialog::DoDataExchange(pDX); OT1  
 //{{AFX_DATA_MAP(CCaptureDlg) @ |bN[XL  
  DDX_Control(pDX, IDC_KEY, m_Key); 4( Q_J4}P  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #[|~m;K(w  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 4@2<dw|*h  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j7(sYo@x7  
  DDX_Text(pDX, IDC_PATH, m_Path);  {{hp;&x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); B,Pbm|U1  
 //}}AFX_DATA_MAP U GA_^?4  
} [i[*xf-B  
4?+K:e #F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) a`c#- je  
//{{AFX_MSG_MAP(CCaptureDlg) 4LG[i}u.N  
 ON_WM_SYSCOMMAND() 26SXuFJ@  
 ON_WM_PAINT() j@N z  
 ON_WM_QUERYDRAGICON() CSKOtqKQ)  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) C`G+b{o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L]wWJL  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9((BOq  
//}}AFX_MSG_MAP ~ m/nV81  
END_MESSAGE_MAP() Xk9mJ]31LC  
A -C.Bi;/  
BOOL CCaptureDlg::OnInitDialog() wM$N#K@  
{ `ChS$p"A  
 CDialog::OnInitDialog(); mf~Joluc J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); VI xGD#m  
 ASSERT(IDM_ABOUTBOX < 0xF000); xwuGJ   
 CMenu* pSysMenu = GetSystemMenu(FALSE); [ B{F(~O  
 if (pSysMenu != NULL) Q6Ay$*y=D  
 { ///  
  CString strAboutMenu; C bWz;$r  
  strAboutMenu.LoadString(IDS_ABOUTBOX); UB5CvM28  
  if (!strAboutMenu.IsEmpty()) gmdJ8$  
  { pUc N-WA  
   pSysMenu->AppendMenu(MF_SEPARATOR); BiFU3FlTf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (/mR p  
  } ?*oBevUnCY  
 } 6tx5{Xl-o  
 SetIcon(m_hIcon, TRUE); // Set big icon 4*AkUkP:T  
 SetIcon(m_hIcon, FALSE); // Set small icon Tu!2lHK;  
 m_Key.SetCurSel(0); ]=gNA  
 RegisterHotkey(); y?6J%~\WP  
 CMenu* pMenu=GetSystemMenu(FALSE); \ltbiDP2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -yP|CZM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~Q+E""  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;;4>vF#*  
 return TRUE; // return TRUE unless you set the focus to a control '99rXw  
} Zz,j,w0 Z  
d}RU-uiW  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O]-)?y/  
{ F"-u8in`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c)*,">$#  
 { ojc m%yd  
  CAboutDlg dlgAbout; n-"(lWcp  
  dlgAbout.DoModal(); >PY Lk{q  
 } 1bz%O2U-(  
 else ?\Bm>p% +  
 { p*NKM} ]I  
  CDialog::OnSysCommand(nID, lParam); !W\za0p  
 } o+],L_Ab  
} {yzo#"4Oy  
k)3b0T@b  
void CCaptureDlg::OnPaint() B*OEG*t  
{ R|@?6<  
 if (IsIconic()) yG' 5:  
 { < `Xt?K  
  CPaintDC dc(this); // device context for painting ^P!(* k#T  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);  JT,[;  
  // Center icon in client rectangle ngt?9i;N  
  int cxIcon = GetSystemMetrics(SM_CXICON); '?Jz8iu-  
  int cyIcon = GetSystemMetrics(SM_CYICON); whW% c8  
  CRect rect; euMJ c  
  GetClientRect(&rect); 3wYhDxY1  
  int x = (rect.Width() - cxIcon + 1) / 2; g[c_rty  
  int y = (rect.Height() - cyIcon + 1) / 2; |j2$G~B6  
  // Draw the icon 7DZZdH$Fm  
  dc.DrawIcon(x, y, m_hIcon); YHp]O+c  
 } e0"80"D  
 else ]lqe,>  
 { (v,g=BS,  
  CDialog::OnPaint(); ;hgRMkmz4<  
 } SG4)kQ  
} eqY8;/  
0Yk$f1g  
HCURSOR CCaptureDlg::OnQueryDragIcon() yC:C  
{ ^KF%Z2:$  
 return (HCURSOR) m_hIcon; @e#{Sm  
} I&J>   
#?h-<KQQ  
void CCaptureDlg::OnCancel() S'_2o?fs  
{ ]as+gZ8  
 if(bTray) CJYpgSr  
  DeleteIcon(); WHy r;m3)  
  CDialog::OnCancel(); 3j6Am{9  
} u|+Dqe`  
#rI4\K  
void CCaptureDlg::OnAbout() )p`zN=t  
{ <~bvf A=  
 CAboutDlg dlg; ;%Zu[G`C  
 dlg.DoModal();  ~LF/wx>  
} 0{'m":D9  
J $^"cCMr  
void CCaptureDlg::OnBrowse() 0sP*ChY5S  
{ N|2PW ~,  
 CString str; &5y|Q?  
 BROWSEINFO bi;  rY CIU  
 char name[MAX_PATH]; df)S}}#H  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3Viz0I<%  
 bi.hwndOwner=GetSafeHwnd(); rqWD#FB=z  
 bi.pszDisplayName=name; e9;5.m  
 bi.lpszTitle="Select folder"; >c@jl  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Tr.u'b(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); mhgvN-? "h  
 if(idl==NULL) WB.w3w [f  
  return; ce<88dL  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); s$Vz1B  
 str.ReleaseBuffer(); ZA7b;{o [  
 m_Path=str; >sGiDK @  
 if(str.GetAt(str.GetLength()-1)!='\\') "rnVPHnQR  
  m_Path+="\\"; W|L#Q/ RX  
 UpdateData(FALSE); !!<H*9]+W;  
} 3kavzB[  
!y&<IT(\4  
void CCaptureDlg::SaveBmp() ++!'6! l  
{ 0i>>CvAl}  
 CDC dc; <xlyk/  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); or`D-x)+@  
 CBitmap bm; LlcH#L$  
 int Width=GetSystemMetrics(SM_CXSCREEN); $ vBFs]h  
 int Height=GetSystemMetrics(SM_CYSCREEN); tx$`1KA  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b?j\YX[e  
 CDC tdc; bo-lT-I  
 tdc.CreateCompatibleDC(&dc); |Sv}/ P-  
 CBitmap*pOld=tdc.SelectObject(&bm); `hDH7u!U.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #2dH2k\F  
 tdc.SelectObject(pOld); .k"unclT0  
 BITMAP btm; ,: Ij@u>)  
 bm.GetBitmap(&btm); 6Zx)L|B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )@],0yL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f<;eNN  
 BITMAPINFOHEADER bih; sdBB(  
 bih.biBitCount=btm.bmBitsPixel; x3l~kZ(  
 bih.biClrImportant=0; qm6X5T  
 bih.biClrUsed=0; KjK-#F,@  
 bih.biCompression=0; iBk1QRdn  
 bih.biHeight=btm.bmHeight; #'5{ ?Cb  
 bih.biPlanes=1; 629ogJo8  
 bih.biSize=sizeof(BITMAPINFOHEADER); (H;,E-  
 bih.biSizeImage=size; Zg3 /,:1  
 bih.biWidth=btm.bmWidth;  ^+wA,r.  
 bih.biXPelsPerMeter=0; {ceY:49  
 bih.biYPelsPerMeter=0; mq+x=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hz+c]K  
 static int filecount=0; Z=be ki]  
 CString name; =J`M}BBx  
 name.Format("pict%04d.bmp",filecount++); `h~-  
 name=m_Path+name; *{(tg~2'(  
 BITMAPFILEHEADER bfh; bAEwjZ  
 bfh.bfReserved1=bfh.bfReserved2=0; [JEf P/n|.  
 bfh.bfType=((WORD)('M'<< 8)|'B'); AEd9H +I  
 bfh.bfSize=54+size; 9z+ZFIf7d  
 bfh.bfOffBits=54; :pLaxWus!  
 CFile bf; EGzlRSgO  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ fLZ99?J  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D%= j@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6J <.i  
  bf.WriteHuge(lpData,size); ZU;nXqjc  
  bf.Close(); tu^C<MV  
  nCount++; Ry40:;MYN  
 } jt0f*e YE8  
 GlobalFreePtr(lpData); Pp.] /;  
 if(nCount==1) y\=^pla  
  m_Number.Format("%d picture captured.",nCount); :Q}Zb,32  
 else z,RjQTd  
  m_Number.Format("%d pictures captured.",nCount); CQs,G8 \/  
  UpdateData(FALSE); p@eW*tE  
} C8O<fwNM  
qG3MyK%O\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <l< y R?  
{ C6qGCzlG`  
 if(pMsg -> message == WM_KEYDOWN) A+Kp ECP  
 { -ZoAbp$  
  if(pMsg -> wParam == VK_ESCAPE) U lPhW~F)  
   return TRUE; a>&dAo}  
  if(pMsg -> wParam == VK_RETURN) Zd]ua_)I%[  
   return TRUE; M63t4; 0A  
 } )O8w'4P5  
 return CDialog::PreTranslateMessage(pMsg); -0+h&CO  
}  63VgQ  
IeAi'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C3KAQ U  
{ l4 YTR4D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y>c Yw!  
  SaveBmp(); y m?uj4I{  
  return FALSE; drJUfsxV  
} usw(]CnH  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )BZ6QO`5n  
 CMenu pop; sY* qf=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); h#Z~x  
 CMenu*pMenu=pop.GetSubMenu(0); cvC 7#i[G  
 pMenu->SetDefaultItem(ID_EXITICON); zd=N.  
 CPoint pt; esd9N'.Q*  
 GetCursorPos(&pt); e 3TKg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \"9ysePI  
 if(id==ID_EXITICON) CYdYa|  
  DeleteIcon(); 6M[OEI5  
 else if(id==ID_EXIT) Bqw/\Lxwlf  
  OnCancel(); s14 ot80)  
 return FALSE; 5}2148  
} YoSBS   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); u17 9!  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2tS,q_-=  
 AddIcon(); HE-ErEtGB  
 return res; jpZ 7p ;  
} x??H%'rP  
~BgNM O;|  
void CCaptureDlg::AddIcon() \^dYmU  
{ K/$5SN1  
 NOTIFYICONDATA data; {Hz;*1?$k  
 data.cbSize=sizeof(NOTIFYICONDATA); T3t w.yh  
 CString tip; QG5 c>Q  
 tip.LoadString(IDS_ICONTIP); ,7;euV5X  
 data.hIcon=GetIcon(0); Wf =hFc1_@  
 data.hWnd=GetSafeHwnd(); 9 u>X,2gUR  
 strcpy(data.szTip,tip); jSw>z`'#H  
 data.uCallbackMessage=IDM_SHELL; <1<0odB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; M&KJZ  
 data.uID=98; /}S1e P6  
 Shell_NotifyIcon(NIM_ADD,&data); EQX?Zs?C  
 ShowWindow(SW_HIDE); :/6u*HwZh  
 bTray=TRUE; >fp_$bjd  
} VqS1n  
VP^{-mDph  
void CCaptureDlg::DeleteIcon() o97*3W]  
{ vb$i00?  
 NOTIFYICONDATA data; 7b(r'b@N  
 data.cbSize=sizeof(NOTIFYICONDATA); o[g]Va*8  
 data.hWnd=GetSafeHwnd(); N~DO_^  
 data.uID=98; C\* 0621  
 Shell_NotifyIcon(NIM_DELETE,&data); OKnpG*)u=g  
 ShowWindow(SW_SHOW); 2 ;Q|h$ n  
 SetForegroundWindow(); 54Vb[;`Kkb  
 ShowWindow(SW_SHOWNORMAL); ;oOv~ YB7H  
 bTray=FALSE; EV_u8?va  
} /a\]Dwj5  
k;HI-v  
void CCaptureDlg::OnChange() Is!+ `[ma  
{  >1q:-^  
 RegisterHotkey(); ckbD/+  
} ,S1'SCwVdJ  
7e Hj"_;  
BOOL CCaptureDlg::RegisterHotkey() Fu65VLKh  
{ hmI> 7@&  
 UpdateData(); -pQ0,/}K  
 UCHAR mask=0; uCj)7>}v{M  
 UCHAR key=0; 2,p= %  
 if(m_bControl) IeB^BD+j  
  mask|=4; V5+|H1=  
 if(m_bAlt) 33NzQb  
  mask|=2; LG=_>:~t>  
 if(m_bShift) !X1 KOG  
  mask|=1; =g)SZK  
  key=Key_Table[m_Key.GetCurSel()]; Nk?L<'  
 if(bRegistered){ ht*;,[ea  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); JQSczE3  
  bRegistered=FALSE; ]T%wRd5&-  
 } /brHB @$  
 cMask=mask; 'Ecd\p  
 cKey=key; &7KX`%K"D  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ~uuM0POo  
 return bRegistered; ZSn6JV'g  
} A6#v6iT  
v&xhS yZ  
  四、小结 zI_pP?4;.q  
SA~oGgk=P  
  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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