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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: pBo=omQV  
  FU]jI[  
  一、实现方法 p./9^S  
ngmHiI W  
  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: ,3+#?H  
UNK}!>HD  
#pragma data_seg("shareddata")  .7GTL  
HHOOK hHook =NULL; //钩子句柄 .J?cV;:`  
UINT nHookCount =0; //挂接的程序数目 V{qpha4'P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 P_(QG 6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 },r9f MJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _x+)Tv  
static int KeyCount =0; CEQs}bz  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JU>F&g/|  
#pragma data_seg() 'YFy6rds  
iX]tL:,~i  
  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。 LN=6u  
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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: x:wv#Wh:l7  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Q)mYy  
cKey,UCHAR cMask) NW=gi qB  
{ 92F 9)S{"  
 BOOL bAdded=FALSE; 86 $88`/2  
 for(int index=0;index<MAX_KEY;index++){ N [qNSo|  
  if(hCallWnd[index]==0){ zE,1zBS<  
   hCallWnd[index]=hWnd;  }BFX7X  
   HotKey[index]=cKey; 7+'&(^c  
   HotKeyMask[index]=cMask; $[S)A0O  
   bAdded=TRUE; gUa-6@  
   KeyCount++; bd'io O  
   break; 5rX_85]  
  } rt8"U <~  
 } \+iZdZD  
 return bAdded; rS|nO_9f  
} Iu V7~w  
//删除热键 NCX`-SLv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >f\$~cp  
{ 3*8m!gq7s  
 BOOL bRemoved=FALSE; 7T69tQZ<  
 for(int index=0;index<MAX_KEY;index++){ xj< K6  
  if(hCallWnd[index]==hWnd){ d?6\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  Iz_#wO  
    hCallWnd[index]=NULL; &x"hM  
    HotKey[index]=0; 6<t<hP_3O  
    HotKeyMask[index]=0; xI>HY9i )  
    bRemoved=TRUE; S UB rFsA  
    KeyCount--; I+GP`=\  
    break; 3[*x'"Q;H  
   } %(}%#-X  
  } )B$Uo,1  
 } "=Xky,k  
 return bRemoved; '.gLqm}%  
} )x& 4 Q=  
xofxE4.  
pr w% )#,  
  DLL中的钩子函数如下: HrK7qLw7  
+~n"@ /  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [wkSY>Gu  
{ q.:j yj6  
 BOOL bProcessed=FALSE; *KYh_i  
 if(HC_ACTION==nCode) uY;7&Lw y1  
 { K3;~|U-l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Xs Ey8V  
   switch(wParam) c&"OhzzJK'  
   {  -/ YY.F-  
    case VK_MENU: M`D`-vv  
     MaskBits&=~ALTBIT; MwE^.6xl{  
     break; ,>3b|-C-  
    case VK_CONTROL: Hfo/\\  
     MaskBits&=~CTRLBIT; XjFaP {  
     break; 4(mRLr%l@`  
    case VK_SHIFT: w,zm$s^  
     MaskBits&=~SHIFTBIT; pY$DOr- r`  
     break; 2J&J  
    default: //judge the key and send message 2=RQ,@s  
     break; pP)> x*1  
   } fn3DoD+I  
   for(int index=0;index<MAX_KEY;index++){ n2N:rP  
    if(hCallWnd[index]==NULL) <Kk[^.7C;  
     continue; D6fGr$(N%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &BOG&ot  
    { } $oZZKS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \R.Fmeko  
     bProcessed=TRUE; Hd ${I",  
    } k vF[d{l  
   } W@t{pXwLv  
  } OI)U c .  
  else if((lParam&0xc000ffff)==1){ //有键按下 1SG^g*mf  
   switch(wParam) cnL@j_mb  
   { g0M/Sv  
    case VK_MENU: V8947h|&  
     MaskBits|=ALTBIT; i Qa=4'9;  
     break; ;mauA#vd  
    case VK_CONTROL: c :u2a/Q?  
     MaskBits|=CTRLBIT; y{9<>28  
     break; [pzo[0G 'v  
    case VK_SHIFT: S{S.H?{F  
     MaskBits|=SHIFTBIT; 8,&pX ga  
     break; 1Gp| _8  
    default: //judge the key and send message 5e >qBw8t  
     break; rPx:o}&<  
   } oTb4T=  
   for(int index=0;index<MAX_KEY;index++){ f-5}`)`.+  
    if(hCallWnd[index]==NULL) yv(\5)XF  
     continue; H|8i|vbi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GmdS~Fhp  
    { js[H $  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tD+K4 ^  
     bProcessed=TRUE; w9,w?%F  
    } 28,g'k!  
   } @u1mC\G  
  } J%1 2Ey@6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i{MzQE+_^  
   for(int index=0;index<MAX_KEY;index++){ /_ RrNzqy  
    if(hCallWnd[index]==NULL) en8l:INX  
     continue; AkX8v66:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NGAjajB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3h4'DQ.g  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >mp" =Y  
   } 5^ e|802  
  } G]E-2 _t7  
 } 7NP Ny  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /rzZU}3[  
} @YI- @  
+<7a$/L?4  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: lQt* LWd[  
(R^Ca7F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A08{]E#v>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m ol|E={si  
9D H}6fO  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: R zn%!d^$>  
Pi'[d7o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Sz0CP1WB  
{ c n^z=?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u= ydX  
 { Wu U_R E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u;H5p\zAzz  
  SaveBmp(); 6#(rWW "_  
  return FALSE; +*Pj,+;W  
 } ?T7ndXX  
 …… //其它处理及默认处理 &)F# cVB  
} jbs)]fqC;  
OO-b*\QW  
o WcBQ|   
  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。 ;0Mg\~T~'  
> m##JzWLr  
  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。 )"H r3  
}NF7"tOL  
  二、编程步骤 #RVN 7-x  
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  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"; A9C  
)/4U]c{-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hG qZB  
r  |JZU  
  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; RtScv  
BV512+M  
  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; b(?A^ a  
+I_p\/J?w/  
  5、 添加代码,编译运行程序。 S#f}mb0,  
8L,i}hIo.  
三、程序代码 &J}w_BFww  
 &&sCaNb  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL XZ1WY(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JB(P-Y#yyA  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ # NR 9\  
#if _MSC_VER > 1000 8~eYN- #W&  
#pragma once :yE7jXB  
#endif // _MSC_VER > 1000 v@;!fBUt  
#ifndef __AFXWIN_H__ +,A7XBn  
#error include 'stdafx.h' before including this file for PCH ~4C:2  
#endif bT#re  
#include "resource.h" // main symbols X8| 0RU@f  
class CHookApp : public CWinApp :Tn1]a)f6  
{ c(!8L\69V}  
 public: EP}NT)z,{  
  CHookApp(); F<|x_6a\  
  // Overrides 'qnnZE  
  // ClassWizard generated virtual function overrides -40OS=wpA  
  //{{AFX_VIRTUAL(CHookApp) -8D$[@y(  
 public: =3<@{^Eg  
  virtual BOOL InitInstance(); N[8y+2SZ  
  virtual int ExitInstance(); [" nDw<U  
  //}}AFX_VIRTUAL ?R\:6x<  
  //{{AFX_MSG(CHookApp) dT4e[4l  
  // NOTE - the ClassWizard will add and remove member functions here. =~F.7wq*^  
  // DO NOT EDIT what you see in these blocks of generated code ! t*cVDA&K  
  //}}AFX_MSG i}}}x  
  DECLARE_MESSAGE_MAP() HA::(cXL  
}; HT6+OK(~dJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); us3fBY'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pi?[jU[Tn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,?ci+M)  
BOOL InitHotkey(); z{ydP Ra  
BOOL UnInit(); XbL\l  
#endif /8tF7Mmr  
`Wy8g?d;bn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6<+8[o  
#include "stdafx.h" (N`x  
#include "hook.h" d@0&  
#include <windowsx.h> ?~s23%E  
#ifdef _DEBUG *d;D~"E<@  
#define new DEBUG_NEW }~3 %KHT  
#undef THIS_FILE R8YA"(j!L  
static char THIS_FILE[] = __FILE__; &0QtHcXpR  
#endif /ng +IC3  
#define MAX_KEY 100 Q ^z&;%q1  
#define CTRLBIT 0x04 "8YXFg  
#define ALTBIT 0x02 ]eD5It\  
#define SHIFTBIT 0x01 L#X!.  
#pragma data_seg("shareddata") V=DT.u  
HHOOK hHook =NULL; )3RbD#?  
UINT nHookCount =0; > Vvjs  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +7|Qd}\X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K3($,aB}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey )Y:9sd8g7  
static int KeyCount =0; r%^J3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @[(<oX%  
#pragma data_seg() "f-z3kL  
HINSTANCE hins; 2h^9lrQcQG  
void VerifyWindow(); H&3i[D!p  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {9yW8&m  
//{{AFX_MSG_MAP(CHookApp) Z2wgfP`  
// NOTE - the ClassWizard will add and remove mapping macros here. A3=$I&!%  
// DO NOT EDIT what you see in these blocks of generated code! 35X4] t  
//}}AFX_MSG_MAP >7^i>si  
END_MESSAGE_MAP() [r"`r Bw  
~Q/G_^U:  
CHookApp::CHookApp() tW#=St0<.o  
{ KW5u.phv  
 // TODO: add construction code here, L4C_qb k;:  
 // Place all significant initialization in InitInstance :w5p#+/,P  
} e-.s63hm  
"G,$Sqi@  
CHookApp theApp; }xE}I<M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =9@t6   
{ 7)y9% -}  
 BOOL bProcessed=FALSE; D%=FCmL5@=  
 if(HC_ACTION==nCode) g<"k\qs7  
 { e$+/;MRq  
  if((lParam&0xc0000000)==0xc0000000){// Key up qqR8E&Y{  
   switch(wParam) fR6.:7&  
   { %juR6zB%8  
    case VK_MENU: XK7$Xbd  
     MaskBits&=~ALTBIT; j/+e5.EX/  
     break; jaq`A'o5  
    case VK_CONTROL: K=`;D  
     MaskBits&=~CTRLBIT; bPHqZ*f  
     break; Z 71.*  
    case VK_SHIFT: %x G3z7;  
     MaskBits&=~SHIFTBIT; :?.RZKXQF  
     break; js#72T/_n  
    default: //judge the key and send message L&s|<<L  
     break; rS3* k3  
   } ]E/~PV  
   for(int index=0;index<MAX_KEY;index++){ 3] u[NR  
    if(hCallWnd[index]==NULL) <h7FS90S  
     continue; &lp5W)D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E")g1xGaK  
    { O5?Gv??@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ws>2 S  
     bProcessed=TRUE; nD8CP[bRo  
    } ca{u"n  
   } 'eRJQ*0F  
  } %Qc5_of  
  else if((lParam&0xc000ffff)==1){ //Key down #^FDFl  
   switch(wParam) ILQB%0!  
   { D+"-(k  
    case VK_MENU:  T.{sO`  
     MaskBits|=ALTBIT; 'QrvkQ  
     break; ZSo#vQ  
    case VK_CONTROL: %tRQK$]c  
     MaskBits|=CTRLBIT; ?\D=DIN-r  
     break; 8A3pYW-  
    case VK_SHIFT: HI}9 "(t}  
     MaskBits|=SHIFTBIT; !u;r<:g!  
     break; dY'mY~Tv  
    default: //judge the key and send message t@(`24  
     break; `0qBuE_^h  
   } P b(XR+  
   for(int index=0;index<MAX_KEY;index++) .h;PMY+  
   { _Ka6! 9  
    if(hCallWnd[index]==NULL) @Pt,N qj:  
     continue; _poe{@h!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AM ZWPU  
    { 'l| e}eti>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); J"&jR7-9  
     bProcessed=TRUE; WLe9m02r  
    } 7Ib/Cm0d|  
   } Fu%%:3_  
  } uuA q\YZy/  
  if(!bProcessed){ :172I1|7  
   for(int index=0;index<MAX_KEY;index++){ UJWkG^?  
    if(hCallWnd[index]==NULL) 8.'[>VzBL  
     continue; q|23l1 PI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Gc'CS_L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); lW!}OzE(m  
   } )O~V3a  
  } \z4I'"MC.9  
 } @@O=a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {B_pjs  
} fuQb h  
z+Cw*v\Y  
BOOL InitHotkey()  d Xiv8B1  
{ xp4w9.X5(  
 if(hHook!=NULL){ yl=_ /'*  
  nHookCount++; UY!N"[&  
  return TRUE; 5:o$]LkOWC  
 } d? Old  
 else lhk[U!>#  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); .|pyloL.  
  if(hHook!=NULL) u6,NQ^4  
   nHookCount++; I,:R~^qJ8v  
  return (hHook!=NULL); G q" [5r"  
} R6N+c\W  
BOOL UnInit() Imi#$bF6  
{ 6U`<+[K7  
 if(nHookCount>1){ d0;$k,  
  nHookCount--; yz CQ  
  return TRUE; jBTXs5q  
 } J9kmIMq-C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FHu -';  
 if(unhooked==TRUE){ c~1X/,biA  
  nHookCount=0; nS53mLU)  
  hHook=NULL; *,UD&N_)*6  
 } i"h '^6M1  
 return unhooked; Y~</vz+H  
} y$]gmg  
4a&*?=GG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TaZw_)4c  
{ XYOPX>$T  
 BOOL bAdded=FALSE; qJQ!e  
 for(int index=0;index<MAX_KEY;index++){ BDeX5/`U#  
  if(hCallWnd[index]==0){ 9 NO^ '  
   hCallWnd[index]=hWnd; !w!}`|q  
   HotKey[index]=cKey; qOusO6  
   HotKeyMask[index]=cMask; h|MTE~   
   bAdded=TRUE; Q bg,q  
   KeyCount++; Zw)*+> +FV  
   break; T.fmEl  
  } @-~ )M_  
 } Q UQ"2oC  
 return bAdded; m5G9 B-\?  
} TJB) ]d<  
<HLe,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *6-fvqCv  
{ :DxCjv  
 BOOL bRemoved=FALSE; `v1Xywg9P  
 for(int index=0;index<MAX_KEY;index++){ [Ipg",Su;f  
  if(hCallWnd[index]==hWnd){ nj (/It  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *q?-M"K  
    hCallWnd[index]=NULL; Q}a,+*N.  
    HotKey[index]=0; HOn,c@.9Y  
    HotKeyMask[index]=0; k k&8:;Vj  
    bRemoved=TRUE; "71,vUW  
    KeyCount--; Tr^Egw]  
    break; "w)Y0Qq*z  
   } N(%%bHi#V  
  } hr T_0FZV  
 } /-#1ys#F=  
 return bRemoved; QW5S=7  
} $#cZJ@;]  
4>uy+"8PO  
void VerifyWindow() ~{#$`o=  
{ >t[beRcR6  
 for(int i=0;i<MAX_KEY;i++){ C+*qU  
  if(hCallWnd!=NULL){ U5 `h  
   if(!IsWindow(hCallWnd)){ ]%{.zl!  
    hCallWnd=NULL; %TY;}V59b  
    HotKey=0; ^V DJGBk  
    HotKeyMask=0; ECO4ut.d  
    KeyCount--; .`iG} j)\  
   } 14[+PoF^A  
  } _f~(g1sE  
 } `A]CdgA  
} c]#+W@$  
)yV|vn  
BOOL CHookApp::InitInstance() j|`6[93MG  
{ 3'd(=hJ45$  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); kQ,#NR/q6  
 hins=AfxGetInstanceHandle(); BFU6?\r  
 InitHotkey(); -8L 22t  
 return CWinApp::InitInstance(); A`=;yD  
} A@8Ot-t:\2  
b7 pD#v  
int CHookApp::ExitInstance() 5E~?hWAv  
{ j>2Jw'l;?  
 VerifyWindow(); jWn!96NhlL  
 UnInit(); SIJ:[=5!7  
 return CWinApp::ExitInstance(); IL:d`Kbqf  
} xiu?BP?V  
b`NXe7A  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kOe %w-_  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) >&@hm4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `1cGb*b/  
#if _MSC_VER > 1000 z (N3oBW  
#pragma once QT1(= wK3  
#endif // _MSC_VER > 1000 } {! #` 's  
1v)X]nW  
class CCaptureDlg : public CDialog i6"/GSA  
{ IETdL{`~  
 // Construction q P<n<  
 public: Sv*@3x  
  BOOL bTray; ISQC{K']J  
  BOOL bRegistered; }Pm>mQZ},  
  BOOL RegisterHotkey(); uS9:cdH  
  UCHAR cKey; ]!u12^A{  
  UCHAR cMask; QHt;c  
  void DeleteIcon(); 49)A.Bh&!  
  void AddIcon(); @%4MFc0`!  
  UINT nCount; jpL' y1@Ut  
  void SaveBmp(); $jt  UQ1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \5+?wpH  
  // Dialog Data k,EI+lCX  
  //{{AFX_DATA(CCaptureDlg) {U$qxC]M  
  enum { IDD = IDD_CAPTURE_DIALOG }; v&6=(k{E@R  
  CComboBox m_Key; -mSiZ  
  BOOL m_bControl; _%HpB=  
  BOOL m_bAlt; 81\$X  
  BOOL m_bShift; J{GtH[  
  CString m_Path; L{v^:  
  CString m_Number; x.V6C0|6"  
  //}}AFX_DATA Cd4a7<-  
  // ClassWizard generated virtual function overrides 4Xna}7  
  //{{AFX_VIRTUAL(CCaptureDlg) fI{ZElPp  
 public: u9WQ0.  
  virtual BOOL PreTranslateMessage(MSG* pMsg); pNOVyyo>BW  
 protected: 2<d l23  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kI|Vv90l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FiTP-~  
  //}}AFX_VIRTUAL <O`yM2/pS  
  // Implementation s\c*ibxM,  
 protected: < q6z$c)K  
  HICON m_hIcon; R3MbTg  
  // Generated message map functions o8!gV/oy  
  //{{AFX_MSG(CCaptureDlg) QN%w\ JXS  
  virtual BOOL OnInitDialog(); ?/mkFDN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V:M$-6jv  
  afx_msg void OnPaint(); 'Ii%/ Ob!  
  afx_msg HCURSOR OnQueryDragIcon(); (Bta vE  
  virtual void OnCancel(); 5lp L$  
  afx_msg void OnAbout(); L*ZC` .h  
  afx_msg void OnBrowse(); {x{/{{wzv  
  afx_msg void OnChange(); GP"(+5  
 //}}AFX_MSG 7g-#v'.N  
 DECLARE_MESSAGE_MAP() btq`[gAF\  
}; KFCL|9P  
#endif IAr  
.s4hFB^n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Jjb(lW  
#include "stdafx.h" O[p;IG`  
#include "Capture.h" Evz;eobW/  
#include "CaptureDlg.h" JHY0 J &4s  
#include <windowsx.h> a:C'N4K  
#pragma comment(lib,"hook.lib") >*xa\ve  
#ifdef _DEBUG }*!7 Vrep  
#define new DEBUG_NEW Tct[0B  
#undef THIS_FILE ^ <Z^3c>/  
static char THIS_FILE[] = __FILE__; FzOr#(^  
#endif cD-.thHO  
#define IDM_SHELL WM_USER+1 A>"v1Wk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4(aDi;x"w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zE{@'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ;T0Y= yC  
class CAboutDlg : public CDialog c#q OK  
{ |aiP7C  
 public: %IS'R`;3  
  CAboutDlg(); ALw5M'6q0\  
  // Dialog Data yVThbL_YJ  
  //{{AFX_DATA(CAboutDlg) 7w7mE  
  enum { IDD = IDD_ABOUTBOX }; gf!hO$sQ3  
  //}}AFX_DATA uN`{; Av  
  // ClassWizard generated virtual function overrides [3a-1,  
  //{{AFX_VIRTUAL(CAboutDlg) o0-7#2  
 protected: AL.zF\?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /o =V (  
  //}}AFX_VIRTUAL K\ww,S  
  // Implementation Ep% 5wR  
 protected: 0dKI+zgr  
  //{{AFX_MSG(CAboutDlg) kl.)A-6V  
  //}}AFX_MSG +):t6oX|  
  DECLARE_MESSAGE_MAP() +"Pt?k  
}; G Q&9b_  
r`]&{0}23  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) K 7)1wiEj  
{ 0G/VbS  
 //{{AFX_DATA_INIT(CAboutDlg) _(J7^rN  
 //}}AFX_DATA_INIT W_EM k  
} nZ>bOP+,  
(7RxCo=X  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Cc:4n1|]>  
{ fP`g#t)4Tu  
 CDialog::DoDataExchange(pDX); /^~3Ib8Fw+  
 //{{AFX_DATA_MAP(CAboutDlg) lAsDdxB`  
 //}}AFX_DATA_MAP +w Oa  
} ,jWMJ0X/N=  
T ,, Ao36  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DPvM|n`TW  
 //{{AFX_MSG_MAP(CAboutDlg) Bcx-t)[  
 // No message handlers !UE' AB  
 //}}AFX_MSG_MAP D_GIj$%N[  
END_MESSAGE_MAP() yD iL  
hWK}] gF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) cq'opjLf5  
: CDialog(CCaptureDlg::IDD, pParent) 0N3 cC4!  
{ SWr?>dl  
 //{{AFX_DATA_INIT(CCaptureDlg) DpIv <m]  
  m_bControl = FALSE; \1 4"Bgj1  
  m_bAlt = FALSE; 4[z a|t  
  m_bShift = FALSE; ;dl>  
  m_Path = _T("c:\\"); r}OK3J  
  m_Number = _T("0 picture captured."); [h8j0Q@Q  
  nCount=0; N=K|Nw  
  bRegistered=FALSE; yp=Hxf  
  bTray=FALSE; LTu cs }  
 //}}AFX_DATA_INIT 03*` T  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 aG7QLCL  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %iWup:  
} Gx ?p,Fj  
q/xMM `{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RQI?\?o  
{ !|`G<WD  
 CDialog::DoDataExchange(pDX); ]trVlmZXH}  
 //{{AFX_DATA_MAP(CCaptureDlg) ReOp,A/y  
  DDX_Control(pDX, IDC_KEY, m_Key); f[3DKA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;aBK4<-vl  
  DDX_Check(pDX, IDC_ALT, m_bAlt); -SaH_Nuj  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =whZ?,u1   
  DDX_Text(pDX, IDC_PATH, m_Path); jw$3cwddH  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4C^;lK  
 //}}AFX_DATA_MAP P"0S94o:5J  
} V,bfD3S3  
THirh6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wZVY h  
//{{AFX_MSG_MAP(CCaptureDlg) P0J3ci}^  
 ON_WM_SYSCOMMAND() HlqvXt\  
 ON_WM_PAINT() Ktg{-Xl  
 ON_WM_QUERYDRAGICON() ((A]FOIbO  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0es[!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WO W4c&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3jPua)=p  
//}}AFX_MSG_MAP I|lz;i}$  
END_MESSAGE_MAP() Uw^`_\si  
2g1[ E_?  
BOOL CCaptureDlg::OnInitDialog() /5 Wy) -  
{ pN/)$6=  
 CDialog::OnInitDialog(); M}NmA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &~U!X~PpB  
 ASSERT(IDM_ABOUTBOX < 0xF000); T^u][I3*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W R@=[G#TJ  
 if (pSysMenu != NULL) h5WS<P  
 { {]plT~{e  
  CString strAboutMenu; b:/;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); N+x0"~T}I  
  if (!strAboutMenu.IsEmpty()) AOQimjW9a  
  { /W'GX n  
   pSysMenu->AppendMenu(MF_SEPARATOR); U'zW; Lt  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }^WQNdws56  
  } <`*}$Zh  
 } 78>)<$+d  
 SetIcon(m_hIcon, TRUE); // Set big icon an^"_#8DA@  
 SetIcon(m_hIcon, FALSE); // Set small icon `m?%{ \  
 m_Key.SetCurSel(0); U>6MT@\  
 RegisterHotkey(); !)RND 6.  
 CMenu* pMenu=GetSystemMenu(FALSE); 2yR*<yj  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Tx?,]c,(u  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X-9>;Mb~y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); N-|E^XIV  
 return TRUE; // return TRUE unless you set the focus to a control Et ty{r}  
} *@=in7*c  
Mk"+*G  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MB :knj  
{ cVJ"^wgBt  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V0 x[sEW  
 { {~>?%]tf  
  CAboutDlg dlgAbout; kA?a}   
  dlgAbout.DoModal(); Yu-e |:  
 } #+HLb  
 else T!5m'Q.  
 { \y^Od7F  
  CDialog::OnSysCommand(nID, lParam); F+Rtoq|  
 } |WH'aGG  
} QlJ cj+_h  
h`dtcJ0  
void CCaptureDlg::OnPaint() ,<F=\G_f  
{ m8eyAvi 6  
 if (IsIconic()) *T j(IN  
 { OiX:h#  
  CPaintDC dc(this); // device context for painting ^pZ1uN!b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D'Tb=  
  // Center icon in client rectangle $9<q'hf<w  
  int cxIcon = GetSystemMetrics(SM_CXICON); @#K19\dQ  
  int cyIcon = GetSystemMetrics(SM_CYICON); l CHaRR7  
  CRect rect; 90> (`pI=  
  GetClientRect(&rect); `rsPIOu  
  int x = (rect.Width() - cxIcon + 1) / 2; K[0.4+  
  int y = (rect.Height() - cyIcon + 1) / 2; 5G=<2;  
  // Draw the icon 8A}w}h  
  dc.DrawIcon(x, y, m_hIcon); %eWzr  
 } ia 1Sf3  
 else lY/{X]T.(  
 { CI"7* z_  
  CDialog::OnPaint(); ;EbGW&T  
 } :8aa#bA  
} occ^bq  
T%~w~stW  
HCURSOR CCaptureDlg::OnQueryDragIcon() 01N "  
{ \Zz"%i  
 return (HCURSOR) m_hIcon; 0 3fCn"  
} exw~SvT3  
,gGIkl&  
void CCaptureDlg::OnCancel() &C<K|F!j!  
{ cHOtMPyQ  
 if(bTray) MTo<COp($  
  DeleteIcon(); nmZz`P9g  
  CDialog::OnCancel(); << `*o[^L  
} :;W[@DeO[  
B.CUk.  
void CCaptureDlg::OnAbout() A^:[+PJHN  
{ E^w2IIw  
 CAboutDlg dlg; b"n8~Vd  
 dlg.DoModal(); $Llv6<B  
} i'9aQi"G  
)9F-h8 &"  
void CCaptureDlg::OnBrowse() 6yk=4l\  
{ 51j5AbFQ"  
 CString str; \MBbZB9@  
 BROWSEINFO bi; 2g5i3C.q$  
 char name[MAX_PATH]; HA&7 ybl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Jb~$Vrdy  
 bi.hwndOwner=GetSafeHwnd(); H'k$<S  
 bi.pszDisplayName=name; Y,Dd} an  
 bi.lpszTitle="Select folder"; 3qJOE6[}%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ITJ{]7N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); BrF/-F  
 if(idl==NULL) nMXk1`|/)x  
  return; WLl_;BgN  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EdFCaW}""  
 str.ReleaseBuffer(); "%fh`4y3\  
 m_Path=str; 0/K?'&$yvb  
 if(str.GetAt(str.GetLength()-1)!='\\') u3 k%  
  m_Path+="\\"; <knf^D<"  
 UpdateData(FALSE); $/;D8P5/&=  
} nZZNx  
j6v|D>I  
void CCaptureDlg::SaveBmp() -!MrG68  
{ FjRt'  
 CDC dc; /(IV+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8G$ %DZ $  
 CBitmap bm;  m(CW3:|  
 int Width=GetSystemMetrics(SM_CXSCREEN); e??tp]PLn  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~C[p}MED  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  gGF]Dq  
 CDC tdc; p3>(ZWPNV  
 tdc.CreateCompatibleDC(&dc); )_bc:6Q  
 CBitmap*pOld=tdc.SelectObject(&bm); '%Og9Bgd+  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z9 X<W`  
 tdc.SelectObject(pOld); kQ~2mU  
 BITMAP btm; D![42H+-Qd  
 bm.GetBitmap(&btm); !5,>[^y3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |^fubQs;2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <xM$^r)  
 BITMAPINFOHEADER bih; DfYOGs]@  
 bih.biBitCount=btm.bmBitsPixel; 3ARvSz@5  
 bih.biClrImportant=0; Gk_%WY*  
 bih.biClrUsed=0; yg({g "  
 bih.biCompression=0; <Sds5 d  
 bih.biHeight=btm.bmHeight; DV+M;rs  
 bih.biPlanes=1; 9R_2>BDn  
 bih.biSize=sizeof(BITMAPINFOHEADER); %smQ`u|  
 bih.biSizeImage=size; j("$qp v  
 bih.biWidth=btm.bmWidth; \H(r }D$u<  
 bih.biXPelsPerMeter=0; m2c>RCq  
 bih.biYPelsPerMeter=0; @1+C*  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8VG6~>ux'>  
 static int filecount=0; ^n8ioL\*i  
 CString name; AI KLJvte  
 name.Format("pict%04d.bmp",filecount++); -& Qm"-?:  
 name=m_Path+name; t^ _0w[  
 BITMAPFILEHEADER bfh; V{!fag  
 bfh.bfReserved1=bfh.bfReserved2=0; #yNSQd  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Br/qOO:n$}  
 bfh.bfSize=54+size; u.v 5!G  
 bfh.bfOffBits=54; _N8Tu~lqV  
 CFile bf; F`!B!uY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J|*Z*m  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -s~6FrKy  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (Hk4~v6pqC  
  bf.WriteHuge(lpData,size); % mP%W<  
  bf.Close(); '{]1!yMh  
  nCount++; E/bIq}R6  
 } K:!){a[  
 GlobalFreePtr(lpData); 5cc;8i  
 if(nCount==1) J%VcvBaJm  
  m_Number.Format("%d picture captured.",nCount); 0$=Uhi  
 else ?O(@BT  
  m_Number.Format("%d pictures captured.",nCount); BR&T,x/d  
  UpdateData(FALSE); ]5(T{  
} 'I$-h<W  
8: #\g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) pe^hOzVv  
{ (EW<Ggi  
 if(pMsg -> message == WM_KEYDOWN) 5>9KW7^L  
 { i4<&zj})  
  if(pMsg -> wParam == VK_ESCAPE) -,xCUG<g  
   return TRUE; :Y? L*  
  if(pMsg -> wParam == VK_RETURN) 1D2Uomd(  
   return TRUE; &[u>^VO8  
 } 7  s+j)  
 return CDialog::PreTranslateMessage(pMsg); un*Ptc2%  
} zzlqj){F  
JFOto,6L:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :TU|;(p  
{ #+VH]7]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ yf|,/{S  
  SaveBmp(); fPXMp%T!  
  return FALSE; \.0cA4)[$  
} m/{HZKh  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K6uZ4 m;  
 CMenu pop; 0[A4k:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {;:QY 1Q T  
 CMenu*pMenu=pop.GetSubMenu(0); 2T3TD%  
 pMenu->SetDefaultItem(ID_EXITICON); C%c}lv8;^  
 CPoint pt; P:~X az\F  
 GetCursorPos(&pt); XOOWrK7O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NxOiT#YH  
 if(id==ID_EXITICON) euxkw]`h6  
  DeleteIcon(); hbZ]DRg  
 else if(id==ID_EXIT) Qu 7#^%=  
  OnCancel(); )gX7qQ  
 return FALSE; 6snDv4  
} 0^%\! Xxq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3K{XT),  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^oZz,q  
 AddIcon(); }Iyr u3M][  
 return res; j@w+>h  
}  (~59}lu~  
:S['hBMN  
void CCaptureDlg::AddIcon() ioIOyj  
{ Drn{ucIs  
 NOTIFYICONDATA data; Kmk}Yz  
 data.cbSize=sizeof(NOTIFYICONDATA); Z`_`^ \"  
 CString tip; 8}B*a;d  
 tip.LoadString(IDS_ICONTIP); R,Gr{"H  
 data.hIcon=GetIcon(0); #9R[%R7Nz  
 data.hWnd=GetSafeHwnd(); |_<'q h  
 strcpy(data.szTip,tip); v~l_6V}  
 data.uCallbackMessage=IDM_SHELL; rwZI;t$hf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1\'?.  
 data.uID=98; R1!F mZW8  
 Shell_NotifyIcon(NIM_ADD,&data); C]X:@^Hy  
 ShowWindow(SW_HIDE); "7w~0?}  
 bTray=TRUE; .,-,@ZK  
} .2K4<UOAbm  
$q"/q*ys  
void CCaptureDlg::DeleteIcon() B #[UR Z9S  
{ ~RdD6V  
 NOTIFYICONDATA data; |3Fo4K%+  
 data.cbSize=sizeof(NOTIFYICONDATA); Mz?xvP?z  
 data.hWnd=GetSafeHwnd(); fG *1A\t]  
 data.uID=98; P4\{be>e  
 Shell_NotifyIcon(NIM_DELETE,&data); "PFczoRZ  
 ShowWindow(SW_SHOW); E?VPCx  
 SetForegroundWindow(); 0r4,27w  
 ShowWindow(SW_SHOWNORMAL); &1=Je$,  
 bTray=FALSE; k!&G ;6O-  
} |igr3p5Fw  
PIZnzZ@Z;  
void CCaptureDlg::OnChange() "7]YvZYu0  
{ >DFpL$oP  
 RegisterHotkey(); n;Nr[hI  
} *qX!  
p"xti+2,  
BOOL CCaptureDlg::RegisterHotkey() o {W4@:Ib  
{ R*"31&3le4  
 UpdateData(); Qkk3>{I  
 UCHAR mask=0;  +*W9*gl  
 UCHAR key=0; uTWij4)a  
 if(m_bControl) y v$@i A  
  mask|=4; 9s#Q[\B!  
 if(m_bAlt) 6%j v|\>  
  mask|=2; ]JQ+*ZYUE  
 if(m_bShift) 8fG$><@  
  mask|=1; bqo+ b{i\  
  key=Key_Table[m_Key.GetCurSel()]; O#}d!}SIp  
 if(bRegistered){ [N35.O6P6u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .5S< G)Ja  
  bRegistered=FALSE; rE&` G[(b  
 } T<jo@z1UL  
 cMask=mask; 4R c_C0O  
 cKey=key; Czl4^STiC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); A:-MRhE9X  
 return bRegistered; nnzfKn:J  
} jfLkp>2E'  
|D@/4B1P  
  四、小结 fZq_]1(/uP  
mQbpv'N  
  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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