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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: H`8``#-|@S  
  _{vkX<s  
  一、实现方法 `dMqe\o%!  
F["wD O  
  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: SjjIr ^  
*{undZ?(>  
#pragma data_seg("shareddata") v1k)hFjPK  
HHOOK hHook =NULL; //钩子句柄 5m=I*.qE  
UINT nHookCount =0; //挂接的程序数目 0,s$T2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 bb42v7?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 b?4/#&z]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey n 26Y]7N  
static int KeyCount =0; Kz<@x`0   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8By,#T".  
#pragma data_seg() ]u-]'P  
I]Tsz'T!9  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 }),w1/#5u8  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Sx:Ur>?hd5  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1Kvx1p   
cKey,UCHAR cMask) 3QSZ ZJ  
{ xt'tL:d  
 BOOL bAdded=FALSE; o47r<>t  
 for(int index=0;index<MAX_KEY;index++){ RO0>I8c1c  
  if(hCallWnd[index]==0){ 3Y)PU=  
   hCallWnd[index]=hWnd; {Y}dv`G#Iu  
   HotKey[index]=cKey; aw ?=hXR!  
   HotKeyMask[index]=cMask; =z{JgD/  
   bAdded=TRUE; ]%uZ\Q;9p  
   KeyCount++; :0K8h  
   break; p5O",3,A4  
  } bsxTqJ  
 } 4ww]9J  
 return bAdded; )5%C3/Dl!  
} {ng"=3+n  
//删除热键 4`Nt{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vvB(r!  
{ ;TcvA  
 BOOL bRemoved=FALSE; /sR%]q |L  
 for(int index=0;index<MAX_KEY;index++){ v{i7h|e  
  if(hCallWnd[index]==hWnd){ =.|J!x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OI} &m^IOo  
    hCallWnd[index]=NULL; r[.>P$U  
    HotKey[index]=0; obK*rdg ,  
    HotKeyMask[index]=0; s%iOUL2/  
    bRemoved=TRUE; } B396X  
    KeyCount--; Kx"<J@  
    break; SxyONp.$\  
   } w|mb4AyL{?  
  } ,:Vm6u!  
 } :RSz4  
 return bRemoved; PUQES(&  
} 4GG>!@|  
N3t0-6$_  
o }Tz"bN  
  DLL中的钩子函数如下: H 9 C9P17  
+,:^5{9{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R j~  
{ TUT][ =.=  
 BOOL bProcessed=FALSE; ^1:U'jIXO  
 if(HC_ACTION==nCode) oIGrA-T}  
 { c/L>>t  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =H0vE7{*  
   switch(wParam) H?}[r)|(3i  
   {  P+MA*:  
    case VK_MENU: p3ISWJa!  
     MaskBits&=~ALTBIT; `"iY*  
     break; o01kYBD  
    case VK_CONTROL: 9/SXs0  
     MaskBits&=~CTRLBIT; ej&<GM|  
     break; sDgXU@  
    case VK_SHIFT: WqxUXH  
     MaskBits&=~SHIFTBIT; O2{)WWOT  
     break; lcON+j  
    default: //judge the key and send message h@7FY  
     break; ?^' 7+8C*J  
   } UE _fpq  
   for(int index=0;index<MAX_KEY;index++){ dAP|:&y@  
    if(hCallWnd[index]==NULL) 2LCB])X  
     continue; M)?dEgU}M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lX:|iB  
    { OE)~yKy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +u@aJ_^  
     bProcessed=TRUE; X.ONa_  
    } 2c<&eX8"  
   } NT%W;)6m9  
  } :J}t&t  
  else if((lParam&0xc000ffff)==1){ //有键按下 z s Qo$p  
   switch(wParam) <1w/hy&mWN  
   { C0.'_  
    case VK_MENU: 8,?v?uE  
     MaskBits|=ALTBIT; -3Avs9`5  
     break; H-rWDN#  
    case VK_CONTROL: |6J ?8y  
     MaskBits|=CTRLBIT; 4@ILw  
     break; 4vK8kkW1  
    case VK_SHIFT: GwsY-jf  
     MaskBits|=SHIFTBIT; HhA -[p  
     break; y`e4;*1  
    default: //judge the key and send message Xqp|VbDca  
     break; JXiZB 8}  
   } uBg 8h{>  
   for(int index=0;index<MAX_KEY;index++){ @/ J [t  
    if(hCallWnd[index]==NULL) aI zv  
     continue; F} J-gZl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `\=Gp'&Q+  
    { r#WT`pav  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); va/m~k|i  
     bProcessed=TRUE; HLQ"?OFlz  
    } j$fAq\B  
   } v/uO&iQw5  
  } `T/~.`R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `Yc _5&"  
   for(int index=0;index<MAX_KEY;index++){ t{!  
    if(hCallWnd[index]==NULL) T1B|w"In  
     continue; g1(Xg.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JGiKBm;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #Z=tJ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ||2Q~*:  
   } hf!|\f  
  } qv 3^5 d  
 } G DSfT{kK\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,F+B Wot4  
} 5yh/0i5|  
\^+ILYO:$  
  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: &a> lWE  
Y izE5[*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); > 1L=,M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PZ:u_*Vu`  
I^*'.z!4Q  
  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: P`$12<\O1  
Ocg"M Gb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^s7,_!.Pq  
{ %k f>&b,Mi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `T ^G^7&  
 { \a "Ct'  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u]C`6)>  
  SaveBmp(); O(2cWQ  
  return FALSE; ?{o/I\\  
 } [~5p>'  
 …… //其它处理及默认处理 iWXc  
} -y) ,Y |  
l2v_?j-)x  
FHy76^h>e  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 pvWau1ArNq  
Hyk'c't_O  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ;SwC&.I  
>Dm8m[76  
  二、编程步骤 q)u2Y]  
@b&84Gn2 r  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 3 K/Df#  
ske@uzAz  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 'iSAAwT2aj  
oR+-+-? ?$  
  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; ~%w~-O2  
TmRx KrRs  
  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; fT:}Lj\L1  
n[xkSF^)  
  5、 添加代码,编译运行程序。 $BN15x0/:~  
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三、程序代码 Ob+9W  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3{raKM6F  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !&kL9A).  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (Ha@s^?.C  
#if _MSC_VER > 1000 zbw7U'jk  
#pragma once ! U0z"  
#endif // _MSC_VER > 1000 \L!uHAE2a  
#ifndef __AFXWIN_H__ `&7RMa4=  
#error include 'stdafx.h' before including this file for PCH r2*<\ax  
#endif )9"oL!2h  
#include "resource.h" // main symbols :LJ7ru2  
class CHookApp : public CWinApp )yee2(S  
{ Y,z??bm~J  
 public: MKGS`X]<J  
  CHookApp(); ={(j`VSUX0  
  // Overrides Q}%tt=KD  
  // ClassWizard generated virtual function overrides $FM' 3%B[  
  //{{AFX_VIRTUAL(CHookApp) AG"l1wz  
 public: 7l8[xV  
  virtual BOOL InitInstance(); jdRq6U^  
  virtual int ExitInstance(); ;Kxbg>U  
  //}}AFX_VIRTUAL dFW=9ru+MQ  
  //{{AFX_MSG(CHookApp)  |qcD;  
  // NOTE - the ClassWizard will add and remove member functions here. a^nAZ  
  // DO NOT EDIT what you see in these blocks of generated code ! uq7T{7~<  
  //}}AFX_MSG Os),;W0w4  
  DECLARE_MESSAGE_MAP() V}8$p8#<@  
}; To"dG& h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g9tu %cIkR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Eyh|a. )-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8m=Z|"H@  
BOOL InitHotkey(); u4'z$>B  
BOOL UnInit(); *DeTqO65  
#endif uF(k[[qaiN  
C? m,ta3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. =Z0t :{  
#include "stdafx.h" ,cHU) j  
#include "hook.h" e29y7:)c=  
#include <windowsx.h> .CV _\  
#ifdef _DEBUG Rc$h{0K8  
#define new DEBUG_NEW AY2:[ 5cm  
#undef THIS_FILE \^532FIw6  
static char THIS_FILE[] = __FILE__; NGzgLSm\  
#endif t\y-T$\\  
#define MAX_KEY 100 97~K!'/^+y  
#define CTRLBIT 0x04 kl7A^0Qrz  
#define ALTBIT 0x02 a% ,fXp>  
#define SHIFTBIT 0x01 q=c/B(II!  
#pragma data_seg("shareddata") 4I~i)EKy6  
HHOOK hHook =NULL; M]_E  
UINT nHookCount =0; D5]{2z}k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey iLq#\8t^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT lglYJ,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !e8i/!}^S  
static int KeyCount =0; I lG:X)V%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \P?ToTTV  
#pragma data_seg() @ RR\lZ  
HINSTANCE hins; R9dP,<2  
void VerifyWindow(); BA+_C]%ZJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U{1z;lJ  
//{{AFX_MSG_MAP(CHookApp) us{nyil1  
// NOTE - the ClassWizard will add and remove mapping macros here. hY8#b)l~lu  
// DO NOT EDIT what you see in these blocks of generated code! ?C;JJ#Ho  
//}}AFX_MSG_MAP D[Iq n  
END_MESSAGE_MAP() u}jrfKd E  
h8}8Lp(/'  
CHookApp::CHookApp() g'lT  
{ YB!!/ SX4  
 // TODO: add construction code here, (!zM\sF  
 // Place all significant initialization in InitInstance 3 ]}'TA`v  
} (aKZ5>>cN  
}5gr5g\OtP  
CHookApp theApp; _vrWj<wyf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w=J4zkWk  
{ D1"7s,Hmu  
 BOOL bProcessed=FALSE; /8eW@IO.F  
 if(HC_ACTION==nCode) c~tAvDX  
 { tHI*,  
  if((lParam&0xc0000000)==0xc0000000){// Key up "DckwtG:%  
   switch(wParam) = HE m)  
   { %?tq;~|]Q  
    case VK_MENU: Z;<ep@gy~  
     MaskBits&=~ALTBIT; TbNGgjT  
     break; [&VxaJ("3  
    case VK_CONTROL: lizTRVBE  
     MaskBits&=~CTRLBIT; Fj=NiZ=  
     break; 0'yyfz  
    case VK_SHIFT: DX@}!6|T  
     MaskBits&=~SHIFTBIT; FBY ODw  
     break; B=zMYi  
    default: //judge the key and send message Q=+8/b  
     break; @-6?i)  
   } hZuYdV{'h  
   for(int index=0;index<MAX_KEY;index++){ b=LF%P  
    if(hCallWnd[index]==NULL) < 5ZJ]W  
     continue; YFx=b!/ s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :XS"# ^aJ  
    { .hN3`>*V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h~ha  
     bProcessed=TRUE; YvTA+yL  
    } -CU,z|g+  
   } gMZ&,n4  
  } u%opY<h  
  else if((lParam&0xc000ffff)==1){ //Key down <o@)SD~K  
   switch(wParam) #v8Cy|I  
   { 79tJV  
    case VK_MENU: BX$hAQ(6Q  
     MaskBits|=ALTBIT; `Cj,HI_/*  
     break; `^%GN8d}nm  
    case VK_CONTROL: "6V_/u5M;=  
     MaskBits|=CTRLBIT; O,9X8$5H-a  
     break; >eo8  
    case VK_SHIFT: jOl1_  
     MaskBits|=SHIFTBIT; NgxO&Zp  
     break; RndOm.TE  
    default: //judge the key and send message qJMp1DC  
     break; `u=<c  
   } h.b+r~u  
   for(int index=0;index<MAX_KEY;index++) >B~?dTm  
   { s1=u{ET  
    if(hCallWnd[index]==NULL) '3%*U*I  
     continue; Oxn'bh6R0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4TJ!jDkox  
    { \UQ],+H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mcb<[~m  
     bProcessed=TRUE; ;U7t  
    } M9g1d7%  
   } AI fk"2  
  } S ljZ~x,!  
  if(!bProcessed){ mh8nlB  
   for(int index=0;index<MAX_KEY;index++){ h.LSMU (O  
    if(hCallWnd[index]==NULL) t^$Div_%G  
     continue; g.&\6^)8p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DZAH"sb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \[E-:  
   } v<fWc971  
  } ~[;{   
 } &|] Fg5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^z?=?%{  
} R7t bxC  
"0Y&~q[=  
BOOL InitHotkey() "GBUQ}  
{ hGKdGu`0  
 if(hHook!=NULL){ .Bijc G  
  nHookCount++; mg/]4)SF  
  return TRUE; I)uASfT$  
 } Y;PDZb K3  
 else ]eL~L_[G\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }'_:XKLj  
  if(hHook!=NULL) -(  ER4#  
   nHookCount++; e)og4  
  return (hHook!=NULL); % NwoU%q  
} c=<v.J@K  
BOOL UnInit() s @3 zx  
{ &@Yoj%%  
 if(nHookCount>1){ WFks|D:sB  
  nHookCount--; 7x:F!0:  
  return TRUE; pb= HVjW<  
 } 6KBHRt  
 BOOL unhooked = UnhookWindowsHookEx(hHook); b6$4Ul-.  
 if(unhooked==TRUE){ @%7/2k  
  nHookCount=0; ,dq`EsHg`M  
  hHook=NULL; {&b-}f"m  
 } )xbqQW7%0+  
 return unhooked; 7dx4~dF  
} ^f"&}%"M  
6P6Jx;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k dUc&  
{ /3;=xZq  
 BOOL bAdded=FALSE; 'jwTGT5x  
 for(int index=0;index<MAX_KEY;index++){ F6h/0i  
  if(hCallWnd[index]==0){ -y<rM0"NE  
   hCallWnd[index]=hWnd; GYTbeY  
   HotKey[index]=cKey; c{ZqQtfM  
   HotKeyMask[index]=cMask; :4b- sg#  
   bAdded=TRUE; 6q!7i%fK?  
   KeyCount++; 8^NE=)cb7w  
   break; +0)5H>h  
  } {S# 5g2  
 } OQ 0b$qw  
 return bAdded; ob)D{4B'  
} 7{8)ykBU^  
13]y)(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m./*LXU  
{ %k~C-+  
 BOOL bRemoved=FALSE; lK 9s0t'  
 for(int index=0;index<MAX_KEY;index++){ O/'f$Zj36  
  if(hCallWnd[index]==hWnd){ Zr~"\llk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fG^7@J w:G  
    hCallWnd[index]=NULL; ZW`HDrP`  
    HotKey[index]=0; LIc*tsl  
    HotKeyMask[index]=0; e1Dj0s?i~K  
    bRemoved=TRUE; !WDn7j'A  
    KeyCount--; 7E@$}&E  
    break; W'8J<VBD  
   } ;%lJD"yF  
  } HX z iDnj  
 } }:tAKO=+  
 return bRemoved; 1Z=;Uy\  
} zbdOCfA;  
i,^>uf  
void VerifyWindow() LjX&' ,  
{ N>h]mX6  
 for(int i=0;i<MAX_KEY;i++){ 1j8/4:  
  if(hCallWnd!=NULL){ VN1# 8{  
   if(!IsWindow(hCallWnd)){ LH1BZ(5g  
    hCallWnd=NULL; +X{cN5Y K  
    HotKey=0; UX+?0K  
    HotKeyMask=0; ,(zcl$A[  
    KeyCount--; 6i55Ja  
   } 4h[2C6 \+`  
  } 9Vh_XBgP  
 } _q2`m  
} 3BuD/bs  
=2Pz$q*ub  
BOOL CHookApp::InitInstance() nau~i1  
{ &*h`b{]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~r7DEy|+  
 hins=AfxGetInstanceHandle(); "`H=AX0  
 InitHotkey(); >I R` ]  
 return CWinApp::InitInstance(); pU[a[  
} t>fA!K%{  
n C\(+K1%  
int CHookApp::ExitInstance() =aX1:Z  
{ OsDp88Bc  
 VerifyWindow(); $,!dan<eA  
 UnInit(); |YMzp8Da(  
 return CWinApp::ExitInstance(); n/,rn>k7:  
} :cIu?7A  
?^F*"+qI  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  'lSnyW{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %> oT7|x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U<#$w{d:  
#if _MSC_VER > 1000 hA$c.jJr.Z  
#pragma once Vw6>:l<+<  
#endif // _MSC_VER > 1000 j=zU7wz)D  
y81#UD9[  
class CCaptureDlg : public CDialog 6tCV{pgm  
{ g0[<9.ke  
 // Construction pb$ An<P  
 public: Lcm~QF7cd  
  BOOL bTray; P W0q71  
  BOOL bRegistered; w0F:%:/  
  BOOL RegisterHotkey(); m7bn%j-{$f  
  UCHAR cKey; n:{-Vvt  
  UCHAR cMask; 6ba2^3GH  
  void DeleteIcon(); W,L>'$#pM  
  void AddIcon(); U/ v"?pg[  
  UINT nCount; Lk$Je O  
  void SaveBmp(); ?et0W|^k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OdtbVF~  
  // Dialog Data ?ZD{e|:u  
  //{{AFX_DATA(CCaptureDlg) rVc zO+E  
  enum { IDD = IDD_CAPTURE_DIALOG }; NG4eEnic!a  
  CComboBox m_Key; QqT6P`0u  
  BOOL m_bControl; &eLQ;<qO*|  
  BOOL m_bAlt; %m0L!|E  
  BOOL m_bShift; ;RTrRh0v  
  CString m_Path; 0|qx/xo|-  
  CString m_Number; ]-+.lR%vd9  
  //}}AFX_DATA &9GR2GY  
  // ClassWizard generated virtual function overrides /;]B1T7  
  //{{AFX_VIRTUAL(CCaptureDlg) JCQx8;V%I  
 public: ;8 /+wBnm  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +)''l  
 protected:  `i_L?C7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h<!khWFS  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e2_r0I^C  
  //}}AFX_VIRTUAL %$!R]B)  
  // Implementation 9Le/'ovq  
 protected: n8y,{|  
  HICON m_hIcon; R-0_226  
  // Generated message map functions 071E%u,  
  //{{AFX_MSG(CCaptureDlg) NC[GtAPD3  
  virtual BOOL OnInitDialog(); SFXfo1dqH  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [f0oB$  
  afx_msg void OnPaint(); )e <! =S  
  afx_msg HCURSOR OnQueryDragIcon(); 1'@lg*^9  
  virtual void OnCancel(); eO[Cb]Dy:  
  afx_msg void OnAbout(); bo?3E +B  
  afx_msg void OnBrowse(); ]CtoK%k  
  afx_msg void OnChange(); d"e%tsj  
 //}}AFX_MSG OL6xMToP  
 DECLARE_MESSAGE_MAP() 0wa!pE"  
}; Ot8S'cB1,$  
#endif %o _0M^3W  
g)| ++?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3 MI) E  
#include "stdafx.h" EY[Q%  
#include "Capture.h" ~*Sbn~U  
#include "CaptureDlg.h" dOYmt,  
#include <windowsx.h> osgS?=8  
#pragma comment(lib,"hook.lib") DRFuvU+e  
#ifdef _DEBUG JCU3\39}  
#define new DEBUG_NEW "gl:4|i '  
#undef THIS_FILE GwIfGixqH  
static char THIS_FILE[] = __FILE__; JWm^RQ  
#endif @{$Cv"6769  
#define IDM_SHELL WM_USER+1 r>:7${pF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o\:f9JL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7! A%6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V?L$ ys  
class CAboutDlg : public CDialog b&V]|Z (  
{ &j~|3  
 public: V3hm*{ON  
  CAboutDlg(); :\w[xqH  
  // Dialog Data 7AFS)_w  
  //{{AFX_DATA(CAboutDlg) ba)YbP[  
  enum { IDD = IDD_ABOUTBOX }; Ns(L1'9=  
  //}}AFX_DATA Vlxb<$5Nh  
  // ClassWizard generated virtual function overrides yPxG`w'  
  //{{AFX_VIRTUAL(CAboutDlg) h/+I-],RF  
 protected: 9'*ZEl^?D  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^xkppN2  
  //}}AFX_VIRTUAL nAba =iW  
  // Implementation E+m"yQp{  
 protected: RNrYT|  
  //{{AFX_MSG(CAboutDlg) ek.WuOs  
  //}}AFX_MSG aSj1P/A  
  DECLARE_MESSAGE_MAP() hhgz=7Y  
}; 1&dsQ, VDl  
J7xT6Q=  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !O-_Dp\#  
{ +` Y ?-  
 //{{AFX_DATA_INIT(CAboutDlg) Ev|{~U  
 //}}AFX_DATA_INIT TWR#MVMI  
} tP^mq>  
p31rhe   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) SAo \H  
{ I3rnCd(  
 CDialog::DoDataExchange(pDX); rjf=qh5s  
 //{{AFX_DATA_MAP(CAboutDlg) 2;(iTPz +  
 //}}AFX_DATA_MAP /5'<w(  
} vaCdfO&  
x_iy;\s1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cZX&itVc:  
 //{{AFX_MSG_MAP(CAboutDlg) bZlLivi  
 // No message handlers 1S.e5{  
 //}}AFX_MSG_MAP 2Q'XB  
END_MESSAGE_MAP() 08n%% F  
P)j9\ muc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zhm!sMlO  
: CDialog(CCaptureDlg::IDD, pParent) MfpWow-#{  
{ V1b_z  
 //{{AFX_DATA_INIT(CCaptureDlg) O> ^~SO  
  m_bControl = FALSE; D>#v 6XI  
  m_bAlt = FALSE; iYQy#kO  
  m_bShift = FALSE; YU0HySP:  
  m_Path = _T("c:\\"); '<W,-i  
  m_Number = _T("0 picture captured."); HF=C8ZtlL  
  nCount=0; 0}7Rm>  
  bRegistered=FALSE; jl0Eg  
  bTray=FALSE; r-Xe<|w  
 //}}AFX_DATA_INIT xS-nO_t 'E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Nb9V/2c;V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OVo  
} Jz3<yQ-  
x^#{2}4u  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) PdN\0B `  
{ a.U:B [v`  
 CDialog::DoDataExchange(pDX); e2o9)=y  
 //{{AFX_DATA_MAP(CCaptureDlg) DW%K'+@M  
  DDX_Control(pDX, IDC_KEY, m_Key); ?9okjLp1n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); BG?2PO{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h _7;UQH  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); KA{DN!  
  DDX_Text(pDX, IDC_PATH, m_Path); GvtI-\h]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?$&rC0 t  
 //}}AFX_DATA_MAP <l s/3!  
} >W]"a3E  
Iybpk?,M+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) nu%Nt"~[%  
//{{AFX_MSG_MAP(CCaptureDlg) Dt'e<d Is  
 ON_WM_SYSCOMMAND() -V_S4|>   
 ON_WM_PAINT() SR8Kzk{  
 ON_WM_QUERYDRAGICON() #2'&=?J1r  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) N4(VRA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :yFCp@&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >s?;2T2"yx  
//}}AFX_MSG_MAP 1Kf t?g  
END_MESSAGE_MAP() lGBdQc]IL  
k<";t  
BOOL CCaptureDlg::OnInitDialog() LmdV@gR  
{ mb`}sTU).  
 CDialog::OnInitDialog(); w8#>xV^~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \R6T" U  
 ASSERT(IDM_ABOUTBOX < 0xF000); HPCA$LD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Nl)jQ  
 if (pSysMenu != NULL) AS"|r  
 { tYNt>9L|  
  CString strAboutMenu; Wq&c,H  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !4.^@^L|\  
  if (!strAboutMenu.IsEmpty()) "8dnFrE  
  { (s*Uz3 sq  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5)NfZN# &  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~{$'sp0  
  } ZUI9[A?  
 } 'n.9qxY;  
 SetIcon(m_hIcon, TRUE); // Set big icon WY~[tBi\  
 SetIcon(m_hIcon, FALSE); // Set small icon 1L qJ@v0  
 m_Key.SetCurSel(0); rL/7wa  
 RegisterHotkey(); &_9e g  
 CMenu* pMenu=GetSystemMenu(FALSE); 'eY[?LJ]U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ddhTr i'f  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3evfX[V#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \gv x)S11  
 return TRUE; // return TRUE unless you set the focus to a control ?o'arxCxZn  
} 0=zS&xM  
gCI'YEx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &: 8&;vk  
{ "$;:dfrU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) PH &ms  
 { $^ dk>Hj>4  
  CAboutDlg dlgAbout; JT^0AZ_*  
  dlgAbout.DoModal(); rX}==`#\  
 } J0bs$  
 else Yaepy3F  
 { ~'\u:Imuo  
  CDialog::OnSysCommand(nID, lParam); 3? CpylCO  
 } R}<s~` Pl  
} JY8pV+q @=  
]h$TgX  
void CCaptureDlg::OnPaint() p5t#d)  
{ &c ~)z\$  
 if (IsIconic()) X^^D[U  
 { TL:RB)- <  
  CPaintDC dc(this); // device context for painting T=Q{K|JE  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l Nto9  
  // Center icon in client rectangle L(S.  
  int cxIcon = GetSystemMetrics(SM_CXICON); dj**,*s  
  int cyIcon = GetSystemMetrics(SM_CYICON); DTVnQC  
  CRect rect; !Shh$iz  
  GetClientRect(&rect); }}R!Y)  
  int x = (rect.Width() - cxIcon + 1) / 2; {0 {$.L  
  int y = (rect.Height() - cyIcon + 1) / 2; rrRC5h  
  // Draw the icon "evV/Fg (  
  dc.DrawIcon(x, y, m_hIcon); &" n9,$  
 } >9|+F [Fc  
 else )Q?[_<1Y+  
 { lI<8)42yq  
  CDialog::OnPaint(); kO"aE~  
 } -e\56%\~_  
} 4;{CR. D  
f#b[KB^Z,2  
HCURSOR CCaptureDlg::OnQueryDragIcon() G dY^}TJrh  
{ "S#hzrEdYI  
 return (HCURSOR) m_hIcon; z H4#\d  
} &>t1A5  
Xxw.{2Ji!q  
void CCaptureDlg::OnCancel() m q9&To!  
{ V@f#/"u'  
 if(bTray) P .(X]+  
  DeleteIcon(); Us.jyg7_c  
  CDialog::OnCancel(); 1Xc%%j  
} j pV  
{4*%\?c,n  
void CCaptureDlg::OnAbout() Pw.+DA  
{ /RJSkF+!  
 CAboutDlg dlg; 3|3lUU\I  
 dlg.DoModal(); e0 EJ[bG  
} F4Z0g*^x  
,/9|j*9H  
void CCaptureDlg::OnBrowse() Jq)k?WS  
{ x|5/#H  
 CString str; >?<d}9X  
 BROWSEINFO bi; Xw5" JE!.  
 char name[MAX_PATH]; i[J',  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %R>MSSjvr  
 bi.hwndOwner=GetSafeHwnd(); VvKH]>*  
 bi.pszDisplayName=name; `#U6`[[  
 bi.lpszTitle="Select folder"; |JQ05nb  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; cKAl 0_[f"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); na)ceN2h  
 if(idl==NULL) T94$}- 5/)  
  return; KQ3 On(d  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); wS4wED&a  
 str.ReleaseBuffer(); \3/'#  
 m_Path=str; qsx1:Ny 1  
 if(str.GetAt(str.GetLength()-1)!='\\') B;Vl+}R  
  m_Path+="\\"; v>R.ou(  
 UpdateData(FALSE); :8g \B{  
} oY:>pxSz<@  
[ Ma9  
void CCaptureDlg::SaveBmp() ]W,g>91m  
{ kE h# 0  
 CDC dc; H++rwVwj#h  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); <Jz>e}*)  
 CBitmap bm; XMdYted  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6D<A@DR9J  
 int Height=GetSystemMetrics(SM_CYSCREEN); !$HWUxM;p  
 bm.CreateCompatibleBitmap(&dc,Width,Height); jL<.?HE  
 CDC tdc; X(9Ff=0.~  
 tdc.CreateCompatibleDC(&dc); :1Cc~+]w(u  
 CBitmap*pOld=tdc.SelectObject(&bm); OMU#Sx!6  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Hn)=:lI  
 tdc.SelectObject(pOld); RZjR d  
 BITMAP btm; sM K/l @7  
 bm.GetBitmap(&btm); B^{DCHu/  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sYzG_* )  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }{"\"Bn_  
 BITMAPINFOHEADER bih; `shB[Lt  
 bih.biBitCount=btm.bmBitsPixel; cae}dHG2  
 bih.biClrImportant=0; TXM.,5Dx\  
 bih.biClrUsed=0; bUNp>H>L  
 bih.biCompression=0; ^ 9i^Ci9  
 bih.biHeight=btm.bmHeight; Oc>-jhx?  
 bih.biPlanes=1; (ym)q#^  
 bih.biSize=sizeof(BITMAPINFOHEADER); I$&/?ns@O  
 bih.biSizeImage=size; PhQD}|S  
 bih.biWidth=btm.bmWidth; M}>q>  
 bih.biXPelsPerMeter=0; JQqDUd  
 bih.biYPelsPerMeter=0; frt?*|:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); iy 5  
 static int filecount=0; ZpyRvDz  
 CString name; tznT*EQr  
 name.Format("pict%04d.bmp",filecount++); jWz-7BO  
 name=m_Path+name; \?Z dUY  
 BITMAPFILEHEADER bfh; U&NOf;h$  
 bfh.bfReserved1=bfh.bfReserved2=0; nJnan,`W  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7>'F=}6[Y  
 bfh.bfSize=54+size; g=.5*'Xlp  
 bfh.bfOffBits=54; c/u;v69r  
 CFile bf; lMP7o&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ F-6* BUqJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @N$r'@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $W2AiE[Wm  
  bf.WriteHuge(lpData,size); +J} 41  
  bf.Close();  E9i WGSE  
  nCount++; fiZ8s=J  
 } >cp9{+#f  
 GlobalFreePtr(lpData); $lQi0*s  
 if(nCount==1) _rM%N+$&d_  
  m_Number.Format("%d picture captured.",nCount); fITml6mbE  
 else Vswi /(  
  m_Number.Format("%d pictures captured.",nCount); _ :z~P<%s  
  UpdateData(FALSE); 7]Egu D4  
} ! 9e>J  
d dPJx<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ra3WLK  
{ @P-7a`3*  
 if(pMsg -> message == WM_KEYDOWN) A28w/ =e7  
 { 3O.-'U1K  
  if(pMsg -> wParam == VK_ESCAPE) khR3[ju{^  
   return TRUE; I'gnw~  
  if(pMsg -> wParam == VK_RETURN) x[X.// :  
   return TRUE; D7 @10;F}[  
 } ^V:YNUqp#  
 return CDialog::PreTranslateMessage(pMsg); &Fi8@0Fh  
} Um~jp:6p  
}MX`WW0\]Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~?p > L  
{ ms$o,[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %wO~\:F8  
  SaveBmp(); X}ZOjX!  
  return FALSE; 1li`+~L F  
} (#:Si~3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;9~z_orNQZ  
 CMenu pop; _YY)-H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }LRAe3N%8  
 CMenu*pMenu=pop.GetSubMenu(0); I4*N  
 pMenu->SetDefaultItem(ID_EXITICON); ^Iz.O  
 CPoint pt; }X UHP%  
 GetCursorPos(&pt); ?:ZH%R_`a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;(sb^O  
 if(id==ID_EXITICON) ]:njP3r  
  DeleteIcon(); 0MOAd!N  
 else if(id==ID_EXIT) L \$zr,=C  
  OnCancel(); @.0,k a,X  
 return FALSE; S$#Awen"@  
} n5b N/  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); H\S,^)drJ?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 29GiNy+ob  
 AddIcon(); m4iR '~L}  
 return res; BK +JHT  
} h3:,Gbyap  
~7m+cWC-+  
void CCaptureDlg::AddIcon() CR/LV]G  
{ VKlD"UTk  
 NOTIFYICONDATA data; IJ0RHDod:  
 data.cbSize=sizeof(NOTIFYICONDATA); _+{s^n=  
 CString tip; ql8:s>1T  
 tip.LoadString(IDS_ICONTIP); vH=I#Ajar  
 data.hIcon=GetIcon(0); G$Dg*<  
 data.hWnd=GetSafeHwnd(); +X< Z 43  
 strcpy(data.szTip,tip); }"T:z{n  
 data.uCallbackMessage=IDM_SHELL; a-W&/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2vwT8/  
 data.uID=98; Ii9vA ^53  
 Shell_NotifyIcon(NIM_ADD,&data); O~D}&M@/R  
 ShowWindow(SW_HIDE); 6hZhD1lDG^  
 bTray=TRUE; #<JrSl62(K  
} G{J9Fb8  
QEVjXJOt0  
void CCaptureDlg::DeleteIcon() R =jK3yfw  
{ AkF1Hj  
 NOTIFYICONDATA data; %8ul}}d9  
 data.cbSize=sizeof(NOTIFYICONDATA); |`|b&Rhu  
 data.hWnd=GetSafeHwnd(); 2@H~nw 0  
 data.uID=98; $OJ*Kul  
 Shell_NotifyIcon(NIM_DELETE,&data); o%dtf5}(,  
 ShowWindow(SW_SHOW); >ko;CQR  
 SetForegroundWindow(); /i]Gg \)  
 ShowWindow(SW_SHOWNORMAL); eI[z%j[Y*  
 bTray=FALSE; NZ_45/(dx  
} 4M:oa#gh@  
a}fW3+>  
void CCaptureDlg::OnChange() [;2v[&Po  
{ u66w('2  
 RegisterHotkey(); Cr&ua|%F  
} 2|T@  
mMMu'N  
BOOL CCaptureDlg::RegisterHotkey() 464Z0C  
{ n_!&Wr^CX  
 UpdateData(); UKzmRa,s  
 UCHAR mask=0; u&<LW4  
 UCHAR key=0; iZ58;`  
 if(m_bControl) ZpZ~[BtQ  
  mask|=4; mdk:2ndP  
 if(m_bAlt) ^^[,aBu  
  mask|=2; l/`Z+];  
 if(m_bShift) cx$Oh`-Car  
  mask|=1; vb%\q sf  
  key=Key_Table[m_Key.GetCurSel()]; tpVtbh1)u  
 if(bRegistered){ ]6nF>C-C  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }vL[N~5\  
  bRegistered=FALSE; =?}'\ >G "  
 } _WkK%RYV  
 cMask=mask; ^yX W.s  
 cKey=key; Jn&(v"_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |k^X!C0  
 return bRegistered; 3B_S>0H"$  
} LWW0lG!_F  
{C3bCVQ]o  
  四、小结 g ` Wr3  
rg $71Ir  
  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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