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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: p _q]Rt  
  lbiMB~rwI  
  一、实现方法 =SLCG.  
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  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: G~KYFNHr  
tW} At  
#pragma data_seg("shareddata") nv_9Llh=z  
HHOOK hHook =NULL; //钩子句柄 L5A?9zum/!  
UINT nHookCount =0; //挂接的程序数目 Rg~F[j$N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m! _*Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 DE" Y(;S  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?`U=Ps  
static int KeyCount =0; j=n<s</V  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9y(491"o  
#pragma data_seg() 7V-'><)gI  
c`xgz#]v  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 dI) 9@UL  
d0D*S?#8,C  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ":V,&o9n  
J~k'b2(p3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _68{ {.  
cKey,UCHAR cMask) N=~aj7B%  
{ 1 JB~G7  
 BOOL bAdded=FALSE; E 9v<VoNP`  
 for(int index=0;index<MAX_KEY;index++){ GLr7sack  
  if(hCallWnd[index]==0){ (V9 ;  
   hCallWnd[index]=hWnd; vw[i.af  
   HotKey[index]=cKey; D=:O ^<  
   HotKeyMask[index]=cMask; j/uu&\e  
   bAdded=TRUE; 2^4OaHY88  
   KeyCount++; vmIt!x  
   break; Rxk0^d:sNi  
  } G'f5MP 1  
 } C}Ucyzfr,p  
 return bAdded; .+$ox-EK8  
} J ` KyS  
//删除热键 ^Rc*X'Iz(!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %)p?&_  
{ SCo;Ek  
 BOOL bRemoved=FALSE; (.N!(;G  
 for(int index=0;index<MAX_KEY;index++){ }-H)jN^  
  if(hCallWnd[index]==hWnd){ >S'IrnH'!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S0mzDLgE  
    hCallWnd[index]=NULL; ^!sIEL  
    HotKey[index]=0; .vWwYG  
    HotKeyMask[index]=0; YK%rTbB(  
    bRemoved=TRUE;  95l)w  
    KeyCount--; gt)wk93d>  
    break; WWG+0jQ9  
   } ]1&} L^a  
  } 9N V.<&~  
 } p d(W(-`8!  
 return bRemoved; oxXCf%!  
} $c}-/U 8  
#8@o%%F d  
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  DLL中的钩子函数如下: @23~)uiZa  
R/Z zmb{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?z0N- A2C2  
{ ?3a:ntX h  
 BOOL bProcessed=FALSE; F P>.@ Y  
 if(HC_ACTION==nCode) SkyX\&  
 { hD9b2KZv  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 SaSj9\o  
   switch(wParam) "r[Ob]/  
   {  (0u(<qA\  
    case VK_MENU: 66-G)+4  
     MaskBits&=~ALTBIT; R(p3* t&n  
     break; W(\ ^6S)  
    case VK_CONTROL: O#?@' 1  
     MaskBits&=~CTRLBIT; 3{9d5p|\i  
     break; }va>jfy  
    case VK_SHIFT: 3 @%XR8ss  
     MaskBits&=~SHIFTBIT; <d~si^*\ch  
     break; ?tx."MZ  
    default: //judge the key and send message y7| 3]>Z  
     break; S pk8u4  
   } xq<X:\O  
   for(int index=0;index<MAX_KEY;index++){ cV:Ak~PKl  
    if(hCallWnd[index]==NULL) 4Be\5Byr  
     continue; MIdViS.g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~}RfepM  
    { ^]MLEr!S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~DP_1V?  
     bProcessed=TRUE; h&2l0 |8k  
    } vX|5*T`(  
   } vp(ow]Q  
  } Ticx]_+~T  
  else if((lParam&0xc000ffff)==1){ //有键按下 bW^C30m  
   switch(wParam) T,h 9xl9i  
   { wEC,Mbn  
    case VK_MENU: b)@rp  
     MaskBits|=ALTBIT; IR|#]en  
     break; vKBi jmE  
    case VK_CONTROL: 3<HZ)w^B  
     MaskBits|=CTRLBIT; 4d\V=_);r  
     break; `k`P;(:  
    case VK_SHIFT: Y&-% N  
     MaskBits|=SHIFTBIT; ]i\;#pj}  
     break; n&3}F?   
    default: //judge the key and send message GQ2/3kt  
     break; Y`rli  
   } nt8& Mf  
   for(int index=0;index<MAX_KEY;index++){ w|c200Is}e  
    if(hCallWnd[index]==NULL) 9qUkw&}H  
     continue; mM.YZUX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0+F--E4  
    { !<?<f db  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); <.&84c]/&  
     bProcessed=TRUE; ?!y<%&U  
    } ;OZl' . %`  
   } m UUNR,  
  } nx{MUN7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 dozC[4mF  
   for(int index=0;index<MAX_KEY;index++){ VS@e[,  
    if(hCallWnd[index]==NULL) %~L"TK`?  
     continue; ~z)JO'Z$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?[7KN8$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1>Q4&1Vn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ll .P>LH  
   } J";4+wA7  
  } e, fZ>EJ  
 } sLUOs]cj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +t3o5&  
} +QNsI2t;r  
V!/9GeIF  
  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: j4I ~  
3OFI> x,h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bEln.)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &f2:aT)  
54=*vokX_  
  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: }(7TiCwd  
I-#7Oq:Np  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )D ~ 5  
{ pQ>|d H+.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OX%#8Lx  
 { U7Oa 13Qz  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bj<s!}i{[  
  SaveBmp(); 4:5M,p  
  return FALSE; )qe rA  
 } xpc{#/Nk  
 …… //其它处理及默认处理 yD#(Iw  
} Cz &3=),G  
D -d  
h'?v(k!  
  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。 sUU[QP-  
Q[ ?R{w6  
  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。 "By$!R-&  
> l]Ble  
  二、编程步骤 Ft?eqDS1  
V>/,&~0  
  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"; vn!5@""T  
hQ'W7EF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; YmOj.Q&  
+abb[  
  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; $JUkw sc  
ja9=b?]0,  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Wf^ sl  
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  5、 添加代码,编译运行程序。 *<X1M~p$  
<p}7T]a7  
三、程序代码 Q-rG~O9-  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL U8J9 #+:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) lrj&60R`w  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ bv VkN  
#if _MSC_VER > 1000 b $yIM  
#pragma once -DK6(<:0  
#endif // _MSC_VER > 1000 %P D}VF/Y  
#ifndef __AFXWIN_H__ uVKe?~RC  
#error include 'stdafx.h' before including this file for PCH `S0`3q}L3%  
#endif _QEw=*.<  
#include "resource.h" // main symbols ;|0P\3  
class CHookApp : public CWinApp TgaxZW  
{ ul#y'iY]  
 public: ~_Fx2T:X  
  CHookApp(); OGIv".~s4  
  // Overrides J/ Lf(;C_  
  // ClassWizard generated virtual function overrides l i)6^f#  
  //{{AFX_VIRTUAL(CHookApp) L""ZI5J{F9  
 public: J]#rh5um  
  virtual BOOL InitInstance(); Z,O* p,Gzn  
  virtual int ExitInstance(); ,SidY\FzH  
  //}}AFX_VIRTUAL H(gY =  
  //{{AFX_MSG(CHookApp) ar#73f  
  // NOTE - the ClassWizard will add and remove member functions here. <b .p/uA  
  // DO NOT EDIT what you see in these blocks of generated code ! c BZ,"kp-  
  //}}AFX_MSG kDDC@A $  
  DECLARE_MESSAGE_MAP() \Oq8kJ=  
}; #4./>}G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^lt2,x   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZE-vroh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A]TEs)#*7)  
BOOL InitHotkey(); y*ZA{  
BOOL UnInit(); :"MHmm=uU8  
#endif Li]96+C$}  
&a=78Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. R?{xs  
#include "stdafx.h" Kei0>hBi  
#include "hook.h" e5 L_<V^Jo  
#include <windowsx.h> WG3!M/4r H  
#ifdef _DEBUG DH%PkGn  
#define new DEBUG_NEW ]WYV  
#undef THIS_FILE `FQ]ad Fz  
static char THIS_FILE[] = __FILE__; rhcax%Cd  
#endif 5a'`%b{{  
#define MAX_KEY 100 ?&-1(&  
#define CTRLBIT 0x04 2|=hF9  
#define ALTBIT 0x02 PPH;'!>s"  
#define SHIFTBIT 0x01 ch :rAx  
#pragma data_seg("shareddata") Sc/l.]k+  
HHOOK hHook =NULL; y: x<`E=  
UINT nHookCount =0; W#~7X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey a#"orc j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -fk;Qq3O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rR :ZTfJs"  
static int KeyCount =0; +Wg/ O -  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >h)kbsSU0z  
#pragma data_seg() bXvO+I<  
HINSTANCE hins; f)j*P<V  
void VerifyWindow(); @fYVlHT%E  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g(9*!g  
//{{AFX_MSG_MAP(CHookApp) NIVR;gm  
// NOTE - the ClassWizard will add and remove mapping macros here. Ht4O5yl"  
// DO NOT EDIT what you see in these blocks of generated code!  $8rnf  
//}}AFX_MSG_MAP IHdA2d?.]  
END_MESSAGE_MAP() ,|s*g'u  
bsDA&~)s  
CHookApp::CHookApp() 38D5vT)n  
{ E I(e3  
 // TODO: add construction code here, w~)tEN>  
 // Place all significant initialization in InitInstance S'8+jY  
} +^+'.xQ  
P%lD9<jED  
CHookApp theApp; # :k=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _%=CW' B  
{ a`n)aXU l  
 BOOL bProcessed=FALSE; ! #_2 ![  
 if(HC_ACTION==nCode) ~qj(&[U{c\  
 { hdCd:6   
  if((lParam&0xc0000000)==0xc0000000){// Key up JR#4{P@A  
   switch(wParam) j :B/ FL  
   { #55:qc>m  
    case VK_MENU: 4qp|g'uXT  
     MaskBits&=~ALTBIT; Rlk3AWl2u  
     break; V%s7*`U  
    case VK_CONTROL: >fzyD(>  
     MaskBits&=~CTRLBIT; j!>P7 8  
     break; ~Ym _ {  
    case VK_SHIFT: I51]+gEN  
     MaskBits&=~SHIFTBIT; :Q>e54]'&  
     break; p$9Aadi]  
    default: //judge the key and send message tRJ5IX##L  
     break; 6vsA8u(|V#  
   } =~hb&  
   for(int index=0;index<MAX_KEY;index++){ G~8BND[."  
    if(hCallWnd[index]==NULL) )g dLb}  
     continue; +4_,, I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =Q40]>bpx  
    { \/YRhQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); QR#>Ws  
     bProcessed=TRUE; K~vJ/9"|R  
    } t_jn-Idcf  
   } uAeo&|&  
  } u6Gqg(7hw  
  else if((lParam&0xc000ffff)==1){ //Key down fV|uKs(W  
   switch(wParam) 6!"wiM"]  
   { p"p~Bx  
    case VK_MENU: a%B&F|u  
     MaskBits|=ALTBIT; wpM2{NTP  
     break; wK-VA$;:  
    case VK_CONTROL: } 7 o!  
     MaskBits|=CTRLBIT; 4F|79U #  
     break; @d0f+9d  
    case VK_SHIFT: K<*6E@+i  
     MaskBits|=SHIFTBIT; aE5-b ub c  
     break; kZz'&xdv'.  
    default: //judge the key and send message "ktuq\a@  
     break; I{cH$jt<  
   } K 77iv  
   for(int index=0;index<MAX_KEY;index++) G-T^1?  
   { c%/b*nQ(=  
    if(hCallWnd[index]==NULL) >|A,rE^Ojt  
     continue; S[3"?$3S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,~naKd.ZY  
    { e9{0hw7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); dgpE3 37Lt  
     bProcessed=TRUE; !2KQi=Ng  
    } x^[,0?y2  
   } 6]b"n'G  
  } "a)6g0gw  
  if(!bProcessed){ oL@-<;zKO  
   for(int index=0;index<MAX_KEY;index++){ T<pG$4_  
    if(hCallWnd[index]==NULL) F)hj\aHm k  
     continue; \t7yH]:>@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ][S q^5`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xKSQz  
   } %m |I=P  
  } +_7a/3kh  
 } :,0(aB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~r.R|f]IQ  
} 4tZ*%!I'  
?Tc#[B  
BOOL InitHotkey() :E.a.-  
{ *I(6hB  
 if(hHook!=NULL){ 3@I0j/1#k1  
  nHookCount++; />S^`KSTM  
  return TRUE; pNb2t/8%%  
 } Sk|e#{  
 else )*]A$\Oc[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R7Y_ 7@p  
  if(hHook!=NULL) '%rT]u3U  
   nHookCount++; p3U)J&]c6  
  return (hHook!=NULL); Rsfb?${0G  
} 9-c3@ >v  
BOOL UnInit() m>vwpRBOA  
{ .Z [4:TS  
 if(nHookCount>1){ R|C`  
  nHookCount--; tr<f ii 3<  
  return TRUE; `HRL .uX  
 } mF;mJq<d  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h+1|.d  
 if(unhooked==TRUE){ BI`)P+K2  
  nHookCount=0; C>+n>bH]L  
  hHook=NULL; ,~d0R4)  
 } jjV'`Vy)  
 return unhooked; GM%OO)dO}  
} X 61|:E  
9S|sTf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [nO3%7t@  
{ $K^l=X  
 BOOL bAdded=FALSE; L?[m$l!T}  
 for(int index=0;index<MAX_KEY;index++){ (kLaXayn  
  if(hCallWnd[index]==0){ @-)?uYw:r  
   hCallWnd[index]=hWnd; ^y/Es2A#t  
   HotKey[index]=cKey; {1Ra |,;  
   HotKeyMask[index]=cMask; (+|+ELfqW  
   bAdded=TRUE; 5I2,za&e  
   KeyCount++; ,>-D xS  
   break; blgA`)GI  
  } ;-Yvi,sS+  
 } TWpw/osW  
 return bAdded; U.<j2K um  
} S/`#6  
bZYayjxZ5i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZG^<<V$h  
{ &THtQ1D  
 BOOL bRemoved=FALSE; .#QE*<T)]  
 for(int index=0;index<MAX_KEY;index++){ <YU?1y?V  
  if(hCallWnd[index]==hWnd){ ^L2d%d\5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !XtG6ON=  
    hCallWnd[index]=NULL; r1r$y2v~  
    HotKey[index]=0; .]vb\NBK7  
    HotKeyMask[index]=0; 3}H{4]*%_  
    bRemoved=TRUE; ;_bRq:!j;  
    KeyCount--; oVpZR$  
    break; WoZU} T-  
   } ))=6g@(  
  } kg^0%-F  
 } Nnh\FaI  
 return bRemoved; NuQ!huh  
} Ku ,wI86  
dun`/QKV  
void VerifyWindow() U*C^g}iA  
{ J 8%gC  
 for(int i=0;i<MAX_KEY;i++){ r/sSkF F  
  if(hCallWnd!=NULL){ GI]\  
   if(!IsWindow(hCallWnd)){ %P0  
    hCallWnd=NULL; 0&,D&y%  
    HotKey=0; m%[e_eS  
    HotKeyMask=0; 1cK'B<5">]  
    KeyCount--; XH?//.q  
   } u}nSdZC  
  } %/Wk+r9uu  
 } n&:ohOH%  
} qk<jvha  
+c~&o83[  
BOOL CHookApp::InitInstance() ]:gW+6w"C  
{ x:FZEyalG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9w=7A>.U  
 hins=AfxGetInstanceHandle(); B"_O!  
 InitHotkey(); 2GptK"MrD  
 return CWinApp::InitInstance();  V;%ug'j  
} _;k<=ns(=  
,H{9`a#+:  
int CHookApp::ExitInstance() 'SFAJ  
{ ,'s }g,L  
 VerifyWindow(); ?62Im^1/  
 UnInit(); qLCNANWnd  
 return CWinApp::ExitInstance(); 9A"s7iJ)  
} 'SXHq>#gA  
o.ZR5`.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !_ W/p`Tc  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) B%8@yS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =%m{|HQ`  
#if _MSC_VER > 1000 J#$U<`j*G  
#pragma once ^bv^&V&IB  
#endif // _MSC_VER > 1000 q-`&C  
SZKYq8ZA)V  
class CCaptureDlg : public CDialog &4:R(]|  
{ M(a%Qk?]/  
 // Construction Vc9rc}  
 public: %V>%AP  
  BOOL bTray; )$!b`u  
  BOOL bRegistered; OIPY,cj~  
  BOOL RegisterHotkey(); u!K1K3T6k  
  UCHAR cKey; FoetP`   
  UCHAR cMask; 8s)b[Z5  
  void DeleteIcon(); ]CzK{-W  
  void AddIcon(); W0f^!}f(  
  UINT nCount; PLkS-B  
  void SaveBmp(); :i<*~0r<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JdS,s5Z>  
  // Dialog Data R;!,(l  
  //{{AFX_DATA(CCaptureDlg) "J"=<_?  
  enum { IDD = IDD_CAPTURE_DIALOG }; N0p6xg~  
  CComboBox m_Key; )95k3xo  
  BOOL m_bControl; G%I .u  
  BOOL m_bAlt; t1hQ0B  
  BOOL m_bShift; G!Brt&_'  
  CString m_Path; GTR*3,rw  
  CString m_Number; O(/~cQ  
  //}}AFX_DATA }&vD(hX  
  // ClassWizard generated virtual function overrides yP{ 52%|+  
  //{{AFX_VIRTUAL(CCaptureDlg) !Aj}sh{  
 public: >Hnm.?-AWl  
  virtual BOOL PreTranslateMessage(MSG* pMsg); B $g\;$G  
 protected: -FJ3;fP&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4gen,^Ij  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {IgH0+z  
  //}}AFX_VIRTUAL V*@aE  
  // Implementation 5REFz  
 protected: j,.M!q]  
  HICON m_hIcon; i M !`4  
  // Generated message map functions 4  eLZ  
  //{{AFX_MSG(CCaptureDlg) 1b3 a(^^E  
  virtual BOOL OnInitDialog(); DKj iooD  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ;O}%SCF7  
  afx_msg void OnPaint(); f]i"tqoI  
  afx_msg HCURSOR OnQueryDragIcon(); =6~  
  virtual void OnCancel(); ?"Ez  
  afx_msg void OnAbout(); ;<M}ZL@m  
  afx_msg void OnBrowse(); Ikdj?"+O  
  afx_msg void OnChange(); Z+v,o1  
 //}}AFX_MSG `^[k8Z(  
 DECLARE_MESSAGE_MAP() A;L ]=J  
}; N~,Ipf  
#endif 0I.KHIB k  
%j\&}>P4$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ui>jJ(  
#include "stdafx.h" Kzrd<h]`)  
#include "Capture.h" uP* kvi:e  
#include "CaptureDlg.h" RxqNgun@  
#include <windowsx.h> )c4tGT<  
#pragma comment(lib,"hook.lib") YD[HBF)~j  
#ifdef _DEBUG 5[4wN( )  
#define new DEBUG_NEW qHub+"2  
#undef THIS_FILE -*k2:i`  
static char THIS_FILE[] = __FILE__; &za }TH m  
#endif <J<"`xKL  
#define IDM_SHELL WM_USER+1 K80f_ iT 5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,,u hEoH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;8^k=8  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s>/Xb2\  
class CAboutDlg : public CDialog {g.YGO  
{ YIRe__7-NU  
 public: n}UJ - \$  
  CAboutDlg(); q=W.82.U  
  // Dialog Data >+J}mo=*  
  //{{AFX_DATA(CAboutDlg) wnC} TWxX  
  enum { IDD = IDD_ABOUTBOX }; mS'Ad<  
  //}}AFX_DATA j{Px}f(=  
  // ClassWizard generated virtual function overrides }!_z\'u  
  //{{AFX_VIRTUAL(CAboutDlg) NfClR HpVc  
 protected: HXU#Ux  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8lM=v> Xc  
  //}}AFX_VIRTUAL 3`&FXgo  
  // Implementation rp4D_80q  
 protected: R0qZxoo  
  //{{AFX_MSG(CAboutDlg) C$[iduS  
  //}}AFX_MSG $0 .6No_|  
  DECLARE_MESSAGE_MAP() W^8  
}; u:APGR^  
Zp7Pw   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5a/A?9?,  
{ HDV-qYD|O~  
 //{{AFX_DATA_INIT(CAboutDlg) U3N d\b'0  
 //}}AFX_DATA_INIT 7<)H?;~;  
} )xy>:2!#Y  
2 H%lN`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \(pwHNSafk  
{ > '=QBW  
 CDialog::DoDataExchange(pDX); ];k!*lR)  
 //{{AFX_DATA_MAP(CAboutDlg) )zxb]Pg+  
 //}}AFX_DATA_MAP L(yUS)O  
} [e` | <  
D \i]gfu8W  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <q=Zg7zB  
 //{{AFX_MSG_MAP(CAboutDlg) `/[5/%  
 // No message handlers :"Xnu%1  
 //}}AFX_MSG_MAP [QxP9EC  
END_MESSAGE_MAP() )!-gT  
]_(hUj._  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Sesdhuy.@  
: CDialog(CCaptureDlg::IDD, pParent) @.7/lRr@bp  
{ }W'j Dz7O  
 //{{AFX_DATA_INIT(CCaptureDlg)  [p6:uNo  
  m_bControl = FALSE; 82@^vX  
  m_bAlt = FALSE; ?7Cm+J  
  m_bShift = FALSE; >>T7;[h  
  m_Path = _T("c:\\"); jVnTpa!A  
  m_Number = _T("0 picture captured."); 8vuTF*{yZ  
  nCount=0; S%MDQTM  
  bRegistered=FALSE; HVus\s\&y%  
  bTray=FALSE; / ]8e[t>!f  
 //}}AFX_DATA_INIT JxinfWk  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]6M<c[H>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I-^sJ@V;  
} oZ*?Uh*  
\=WPJm`p  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ML>M:Ik+  
{ #; !@Pf  
 CDialog::DoDataExchange(pDX); 32K& IfV  
 //{{AFX_DATA_MAP(CCaptureDlg) FXo.f<U  
  DDX_Control(pDX, IDC_KEY, m_Key); BX$<5S@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "9P @bA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^5s7mls  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8?82 p  
  DDX_Text(pDX, IDC_PATH, m_Path); Y#c439&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); MtL<)?HQ  
 //}}AFX_DATA_MAP %j^QK>%  
} @K!JE w\  
@ovaOX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  7V5c`:"  
//{{AFX_MSG_MAP(CCaptureDlg) eHvUgDt  
 ON_WM_SYSCOMMAND() l8?C[, K%  
 ON_WM_PAINT() XB!qPh .  
 ON_WM_QUERYDRAGICON() L'Cd` .yVO  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6qDt 6uB  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %!t9)pNc  
 ON_BN_CLICKED(ID_CHANGE, OnChange) r5xm7- `c  
//}}AFX_MSG_MAP X`_tm3HC  
END_MESSAGE_MAP() 5[)5K?%  
bK6^<,~  
BOOL CCaptureDlg::OnInitDialog() 6MM\nIU)/  
{ BR|0uJ.M  
 CDialog::OnInitDialog(); i&H^xgm  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j-BNHX  
 ASSERT(IDM_ABOUTBOX < 0xF000); JL G!;sov  
 CMenu* pSysMenu = GetSystemMenu(FALSE); C')KZ|JIC  
 if (pSysMenu != NULL) iT&4;W=72~  
 { rSv,;v  
  CString strAboutMenu; GcN}I=4|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Lx>[`QT  
  if (!strAboutMenu.IsEmpty()) +- qk\sQ  
  { ez32k[eV!  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,oH\rrglf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $B?8\>_?  
  } EeMKo  
 } =7e!'cF[  
 SetIcon(m_hIcon, TRUE); // Set big icon 33<{1Y[Q6E  
 SetIcon(m_hIcon, FALSE); // Set small icon 0p.MH~mx  
 m_Key.SetCurSel(0); zwC ,,U  
 RegisterHotkey(); 5{(4%  
 CMenu* pMenu=GetSystemMenu(FALSE); .+S%hT,v6i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); sxr,] @  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,ASNa^7/>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _'w:Sx?d7  
 return TRUE; // return TRUE unless you set the focus to a control w-JWMgY8w  
} n@tt.n!{l  
xGyl7$J  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *bo| F%NAz  
{ kttJTP77t  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {Y5@SI yE  
 { B`)sc ~u  
  CAboutDlg dlgAbout; !2Ompcr1  
  dlgAbout.DoModal(); 1\,k^Je7  
 } Gjeb)Y6N  
 else g"" 1\rc=  
 { MJX4;nbl  
  CDialog::OnSysCommand(nID, lParam); (hOD  
 } A-L1vu;  
} I(7 GVYM  
Pqx?0 f)  
void CCaptureDlg::OnPaint() jY\z+lW6A  
{ >{ {ds--  
 if (IsIconic()) Fc[vs52  
 { mCt/\  
  CPaintDC dc(this); // device context for painting %r.OV_04  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &I=o1F2B)  
  // Center icon in client rectangle i/*)1;xsk  
  int cxIcon = GetSystemMetrics(SM_CXICON); dH5*%  
  int cyIcon = GetSystemMetrics(SM_CYICON); hN K wQ  
  CRect rect; 43h06X`  
  GetClientRect(&rect); HqsqUS3[  
  int x = (rect.Width() - cxIcon + 1) / 2; [2xu`HT02  
  int y = (rect.Height() - cyIcon + 1) / 2; Y[)mHs2  
  // Draw the icon nHeJ20  
  dc.DrawIcon(x, y, m_hIcon); xO:h[  
 } ?8kFAf~  
 else } Ifa5Lq)  
 { 9=$ pV==  
  CDialog::OnPaint(); I}u\ov_Su  
 } 0`.&U^dG  
} |WS@q'  
l8(9?!C  
HCURSOR CCaptureDlg::OnQueryDragIcon() W=EcbH9/.)  
{ U"|1@W#  
 return (HCURSOR) m_hIcon; &Y@),S9  
} m$W2E.-$'#  
zQ:nL*X'Z"  
void CCaptureDlg::OnCancel() zmZU"eWp)  
{ p:b{>lM  
 if(bTray) qF^P\cD  
  DeleteIcon(); HOu$14g  
  CDialog::OnCancel(); h #gI1(uL  
} +C;;4s)  
[4C_iaE  
void CCaptureDlg::OnAbout() 2k=|p@V n~  
{ Has}oe[  
 CAboutDlg dlg; a0]GQyIG  
 dlg.DoModal(); LiFR7\z  
} ea @ H  
7;@YR  
void CCaptureDlg::OnBrowse() Q)4[zStR#  
{ GIYdI#0RC  
 CString str; !wE% <Fh  
 BROWSEINFO bi; >pZ _  
 char name[MAX_PATH]; "LDNkw'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L'$\[~Ug  
 bi.hwndOwner=GetSafeHwnd(); yj'lHC  
 bi.pszDisplayName=name; > .}G[C  
 bi.lpszTitle="Select folder"; X} V]3  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~0024B[G  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  Q'cWqr  
 if(idl==NULL) h`! 4`eI  
  return; GGwwdB\x'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Yur}<>`(  
 str.ReleaseBuffer(); D@ sMCR  
 m_Path=str; n%\\1  
 if(str.GetAt(str.GetLength()-1)!='\\') K!(WcoA&2i  
  m_Path+="\\"; C$q-WoTM(  
 UpdateData(FALSE); a}` M[%d7  
} 4e\wC  
fA?Wf[`x  
void CCaptureDlg::SaveBmp() 4MDVR/Z7  
{ p cUccQ  
 CDC dc; /QL<>g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); cahlYv'  
 CBitmap bm; 'bZw-t!M@  
 int Width=GetSystemMetrics(SM_CXSCREEN); n::i$ZUdK  
 int Height=GetSystemMetrics(SM_CYSCREEN); }Gb^%1%M  
 bm.CreateCompatibleBitmap(&dc,Width,Height); NE`;=26c  
 CDC tdc; $=>:pQbBVX  
 tdc.CreateCompatibleDC(&dc); B^/Cx  
 CBitmap*pOld=tdc.SelectObject(&bm); 0Z((cI\J  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); . P 44t  
 tdc.SelectObject(pOld); [`h,Ti!m<  
 BITMAP btm; 8  rE`  
 bm.GetBitmap(&btm); bg9_$laDi  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; dUn]aS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [Z'4YXS  
 BITMAPINFOHEADER bih; 2>x[_  
 bih.biBitCount=btm.bmBitsPixel; liB~vdqj  
 bih.biClrImportant=0; *a_QuEw _k  
 bih.biClrUsed=0; .'+JA:3R  
 bih.biCompression=0; xzMpTZQ  
 bih.biHeight=btm.bmHeight; 2.j0pg .  
 bih.biPlanes=1; ;CL^2{  
 bih.biSize=sizeof(BITMAPINFOHEADER); *2pE39  
 bih.biSizeImage=size; 4;H m%20g  
 bih.biWidth=btm.bmWidth; h\)ual_r[j  
 bih.biXPelsPerMeter=0; 4K;0.W;~|  
 bih.biYPelsPerMeter=0; N/0Q`cQ-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KVoi>?a   
 static int filecount=0; )i39'0a  
 CString name; R. ryy  
 name.Format("pict%04d.bmp",filecount++); P:'y}a-  
 name=m_Path+name; gi@&Mr)fS  
 BITMAPFILEHEADER bfh; r!>=G%  
 bfh.bfReserved1=bfh.bfReserved2=0; @ohJ'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); '@hnqcqXq  
 bfh.bfSize=54+size; JZyEyN  
 bfh.bfOffBits=54; [sPLu)q2  
 CFile bf; 75Bn p9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =5pwNi_S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )d {8Cu6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y'6P ~C;v  
  bf.WriteHuge(lpData,size); u4=ulgi  
  bf.Close(); ;rCCkA6  
  nCount++; V^9%+L+E5  
 } ~te{9/   
 GlobalFreePtr(lpData); /oM&29 jy  
 if(nCount==1) ~fgS"F^7n  
  m_Number.Format("%d picture captured.",nCount); ,tBc%&.f  
 else +x:VIi  
  m_Number.Format("%d pictures captured.",nCount); X~; *zYd5  
  UpdateData(FALSE); gd31ds!G  
} Tc;BE  
eLN(NSPoS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xdsF! Zb  
{ q=BAYZ\`  
 if(pMsg -> message == WM_KEYDOWN) K,HR=5  
 { Mr K?,7*Xi  
  if(pMsg -> wParam == VK_ESCAPE) {\!@ k\__  
   return TRUE; ol4!#4Y&{  
  if(pMsg -> wParam == VK_RETURN) '(($dT  
   return TRUE; U@:iN..  
 } BS3BJwf; f  
 return CDialog::PreTranslateMessage(pMsg); 9EZh~tdV[  
} )i.\q   
zpxy X|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ? v@q&  
{ );F /P0P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @(tiPV  
  SaveBmp(); ==7=1QfP  
  return FALSE; ##NowO  
} @)@hzXQ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !.={p8X-x  
 CMenu pop; <J1$s_^`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !3at(+4  
 CMenu*pMenu=pop.GetSubMenu(0); Lr(wS {  
 pMenu->SetDefaultItem(ID_EXITICON); b(g?X ( &  
 CPoint pt; J&b&*3   
 GetCursorPos(&pt); ^UpwVKdP  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (e{pAm  
 if(id==ID_EXITICON) oU~e|  
  DeleteIcon(); %1]Lc=[j  
 else if(id==ID_EXIT) PmE2T\{s!  
  OnCancel(); I03 45Hc  
 return FALSE; [Hp"a^~r|  
} 3D7phq>.q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); F a'2i<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Uw_z9ZL  
 AddIcon(); <~qhy{hRn  
 return res; 9_S>G$9D  
} |a Ht6F  
W r;?t!  
void CCaptureDlg::AddIcon() p>]2o\["  
{ &5wM`  
 NOTIFYICONDATA data; R_DZJV O  
 data.cbSize=sizeof(NOTIFYICONDATA); fL1EQ)  
 CString tip; ze%)fZI0f  
 tip.LoadString(IDS_ICONTIP); HV6'0_R0  
 data.hIcon=GetIcon(0); ]O;Rzq{D(  
 data.hWnd=GetSafeHwnd(); )%5T*}j  
 strcpy(data.szTip,tip); s*pgR=dZZ  
 data.uCallbackMessage=IDM_SHELL; 1G+ ?/w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; GwVSRI:[N  
 data.uID=98; AfW9;{j&I  
 Shell_NotifyIcon(NIM_ADD,&data); ?_c*(2i&^  
 ShowWindow(SW_HIDE); t[L'}ig!q  
 bTray=TRUE; wq&TU'O  
} Ijj]_V{,  
9Ic~F^  
void CCaptureDlg::DeleteIcon() vN4g#,<  
{ s*j0uAq)up  
 NOTIFYICONDATA data; r5?qz<WW~  
 data.cbSize=sizeof(NOTIFYICONDATA); 7e-l`]  
 data.hWnd=GetSafeHwnd(); KuO5`  
 data.uID=98; mM7S9^<UH  
 Shell_NotifyIcon(NIM_DELETE,&data); DV/P/1E  
 ShowWindow(SW_SHOW); q[SUYb;,  
 SetForegroundWindow(); N^. !l_  
 ShowWindow(SW_SHOWNORMAL); *m sW4|=^2  
 bTray=FALSE; D~Y 3\KP  
} xem:#>&r  
bP 2IX  
void CCaptureDlg::OnChange() "i1~YE  
{ uB:utg  
 RegisterHotkey(); J5Tl62}  
} =r:-CRq(  
.ZrQ{~t  
BOOL CCaptureDlg::RegisterHotkey() ^dR5fAS  
{ &H{KXX"X  
 UpdateData(); Q4MTedj1H  
 UCHAR mask=0; b1;80P/:D  
 UCHAR key=0; ^4yFLqrC  
 if(m_bControl) GZ]; U] _  
  mask|=4; daZY;_{"o  
 if(m_bAlt) nNFZ77lg  
  mask|=2; tXTa>Q  
 if(m_bShift) )LwB  
  mask|=1; Mc6?]wDB]  
  key=Key_Table[m_Key.GetCurSel()]; a{6rQ  
 if(bRegistered){ HJ*W3Mg  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); a[GlqaQy+-  
  bRegistered=FALSE; b='YCa  
 } "+ji`{  
 cMask=mask; #9Z*.  
 cKey=key; 5xHl6T+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); r=+r5k"`  
 return bRegistered; xla9:*pPn  
} toEmIa~o6  
*Gm%Dn  
  四、小结 {=> <@]N  
NTVdSK7z~H  
  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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