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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: j-.Y!$a%6  
  `csZ*$7  
  一、实现方法 < fV][W  
> >KCd  
  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: $L?KNXHAF!  
vm'ZA7f6  
#pragma data_seg("shareddata") N/--6)5~0  
HHOOK hHook =NULL; //钩子句柄 i'4.w?OZ  
UINT nHookCount =0; //挂接的程序数目 #qpP37G  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ic"8'Rwb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1j:aGj>{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5t"FNL <(M  
static int KeyCount =0; -V;BkE76  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]V_A4Df  
#pragma data_seg() egURRC!  
S!+>{JyQ  
  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。 YRFz ]  
ZfK[o{9>  
  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: :tI F*pC  
/zoy,t-i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR KIag(!&  
cKey,UCHAR cMask) ^YropzHZ4E  
{ U+@U/s%8  
 BOOL bAdded=FALSE; S2_(lS+R  
 for(int index=0;index<MAX_KEY;index++){ m[74p  
  if(hCallWnd[index]==0){ I[d<SHo  
   hCallWnd[index]=hWnd; (xRcG+3];  
   HotKey[index]=cKey; }v4dOGc?  
   HotKeyMask[index]=cMask; `fTM/"  
   bAdded=TRUE; nP]!{J]  
   KeyCount++; upL3M`  
   break; 13`Mt1R  
  } ^B% =P  
 } \6JOBR  
 return bAdded; {svo!pN:  
} 5<R m{  
//删除热键 vIbM@Y4 '?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) });Rjg  
{ ;'= cNj  
 BOOL bRemoved=FALSE; }Mt1C~{(  
 for(int index=0;index<MAX_KEY;index++){ T?t/[iuHrj  
  if(hCallWnd[index]==hWnd){ $R1I(sJ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z+yIP ?s}(  
    hCallWnd[index]=NULL; *^~ =/:  
    HotKey[index]=0; 5$D"uAp<V  
    HotKeyMask[index]=0; h%Nd89//  
    bRemoved=TRUE; a[(OeVQ5  
    KeyCount--; .t5.(0Xk[A  
    break; k[;)/LfhS  
   } "4)N]Nj  
  } 8Auek#[  
 } 2 HEU  
 return bRemoved; [49Cvde^  
} .4)oZ  
hx$61 E=  
cR/Nl pX  
  DLL中的钩子函数如下: O {1" I  
Qs6Vu)U=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a (~Y:v  
{ &uK(. @  
 BOOL bProcessed=FALSE; FklR!*oL,)  
 if(HC_ACTION==nCode) vSH,fS-n  
 { >.d/@3 '  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >8e)V ;  
   switch(wParam) 6]?mjG6  
   {  hul,Yd) Z  
    case VK_MENU: c$Kc,`2m7  
     MaskBits&=~ALTBIT; S\g9 @g.  
     break; lFjz*g2'  
    case VK_CONTROL: OlOOg  
     MaskBits&=~CTRLBIT; \9)5b8  
     break;  GfE>?mG  
    case VK_SHIFT: J:yv82  
     MaskBits&=~SHIFTBIT; = :gKh  
     break; QxYm3x5  
    default: //judge the key and send message yYA*5 7^A  
     break; #'_#t/u  
   } h;gc5"mG  
   for(int index=0;index<MAX_KEY;index++){ ,|:.0g[n  
    if(hCallWnd[index]==NULL) TTz=*t+D  
     continue; DM^0[3XuV5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R^l0Bu]X  
    { %Jt35j@Ee  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >Ku4Il+36  
     bProcessed=TRUE; .<%tu 0  
    } K%v:giN$l`  
   } lYG`)#T  
  } ^wIB;!W  
  else if((lParam&0xc000ffff)==1){ //有键按下 {N4 'g_  
   switch(wParam) P0l fK}  
   { 3W?7hh  
    case VK_MENU: FS1\`#Bm)  
     MaskBits|=ALTBIT;  XIInI  
     break; |[?Otv  
    case VK_CONTROL: NUV">i.(  
     MaskBits|=CTRLBIT; W%L'nR~w$  
     break; 2{79,Js0  
    case VK_SHIFT: g0B] ;Y>(  
     MaskBits|=SHIFTBIT; [bhKL5l  
     break; ^Arv6kD,  
    default: //judge the key and send message ``l*;}  
     break; yB UQ!4e  
   } ?'> .>  
   for(int index=0;index<MAX_KEY;index++){ & =[!L0{  
    if(hCallWnd[index]==NULL) IuXgxR%  
     continue; IC cr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cY5&1Shb~  
    { <x}wy+SG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  0s;~9>  
     bProcessed=TRUE; vb>F)X?b_  
    } AG,><UP  
   } spa :5]B  
  } |5~Oh`w  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =8]`-(  
   for(int index=0;index<MAX_KEY;index++){ >=N-P< %  
    if(hCallWnd[index]==NULL) wkp2A18n  
     continue; ZXnacc~s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B?j t?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); { )qr3-EM#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 x#0?$}f<  
   } BE0l2[i?  
  } ljbAfd  
 } L4B/ g)K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9QX!HQ|5y8  
} C) R hld  
]VQd *~ -  
  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: 1#c Tk  
m5 sW68  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L7{}`O/g7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ),vDn}>  
SF-E>s!XL  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: .]h/M,xg  
f6K.F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6QA`u*  
{ ;8XRs?xyd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $.C-_L  
 { vE^tdzAG  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2? yo  
  SaveBmp(); G\ F>*  
  return FALSE; 2#:p:R8I>  
 } :,JjN&  
 …… //其它处理及默认处理 `dcz9 *  
} W;=Ae~  
oDu6W9+  
hZHM5J~  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 S=-$:65  
8u~  
  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。 >nSt<e  
M\4` S&  
  二、编程步骤 l~;>KjZg  
=W3 K6w  
  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"; <$e|'}>A  
YS^!'IyG/B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; dWQsC|  
?MRY*[$  
  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; Qh&Qsyo%  
=D$ED^W  
  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; PX|@D_%Y=  
D;C';O  
  5、 添加代码,编译运行程序。 @/<UhnI  
~I5hV}ZT  
三、程序代码 L_!ShE  
O,B\|pd2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL nFn!6,>E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v,ssv{gU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4uIYX  
#if _MSC_VER > 1000 g&FTX>wX  
#pragma once :82h GU  
#endif // _MSC_VER > 1000 tNT Sy =  
#ifndef __AFXWIN_H__ {=[>N>"  
#error include 'stdafx.h' before including this file for PCH ?A3L8^tR  
#endif a<G&}|6  
#include "resource.h" // main symbols 27eG8  
class CHookApp : public CWinApp ZUQ _u  
{ P'Rw/c o  
 public: 2 kDsIEA  
  CHookApp(); u;_~{VJ-  
  // Overrides ?mg@zq8  
  // ClassWizard generated virtual function overrides y'_8b=*  
  //{{AFX_VIRTUAL(CHookApp) .hat!Tt9  
 public: \~5|~|9<  
  virtual BOOL InitInstance(); x z _sejKB  
  virtual int ExitInstance(); Py)ZHML  
  //}}AFX_VIRTUAL Nwi|>'\C  
  //{{AFX_MSG(CHookApp) P"w\hF  
  // NOTE - the ClassWizard will add and remove member functions here. sAkr-x?+M  
  // DO NOT EDIT what you see in these blocks of generated code ! _M^.4H2  
  //}}AFX_MSG 9-ozrw8t  
  DECLARE_MESSAGE_MAP() ^xZh@e5  
}; [xMa^A>p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j6rNt|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V ;T :Q%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NX @FUct;  
BOOL InitHotkey(); nr!N%Hi  
BOOL UnInit(); AJPvwu}D  
#endif % Y^J''  
COrk (V  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [,zq  
#include "stdafx.h" ~ Z\:Nx  
#include "hook.h" TktH28tK  
#include <windowsx.h> 4.RQ3SoDa  
#ifdef _DEBUG tdy2ZPVtTV  
#define new DEBUG_NEW ^Co-!jM  
#undef THIS_FILE LFp "Waiv  
static char THIS_FILE[] = __FILE__;  T{YZ`[  
#endif .Eao|;  
#define MAX_KEY 100 rwm^{Qa  
#define CTRLBIT 0x04 zZ5:)YiW-  
#define ALTBIT 0x02 ccD+AGM.  
#define SHIFTBIT 0x01 zG!nqSDG  
#pragma data_seg("shareddata") _VtQMg|u  
HHOOK hHook =NULL; 9Em#Ela  
UINT nHookCount =0; \8`?ir q"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kB\{1;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT !vnQ;g5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GD W@/oQr  
static int KeyCount =0; xmW~R*^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?pDr"XH~  
#pragma data_seg() sDY~jP[Oa  
HINSTANCE hins; D #ddx  
void VerifyWindow(); I[ \~ pi,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JKfG/z|  
//{{AFX_MSG_MAP(CHookApp) @ZKf3,J0  
// NOTE - the ClassWizard will add and remove mapping macros here. |{jT+  
// DO NOT EDIT what you see in these blocks of generated code! ; * [:~5Wc  
//}}AFX_MSG_MAP LF<&gC  
END_MESSAGE_MAP() VJh8`PVX  
!3v&+Jrf6  
CHookApp::CHookApp() bS.w<V Ew  
{ YIU3}sJ!  
 // TODO: add construction code here, I`>U#x*  
 // Place all significant initialization in InitInstance {h<D/:^v  
} {|;a?] ?  
Z6jEj9?O  
CHookApp theApp; i;[y!U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F_-Lu]*  
{ W{p}N  
 BOOL bProcessed=FALSE; a6p0_-MF  
 if(HC_ACTION==nCode) -@To<<`n  
 { *MF9_V)8V  
  if((lParam&0xc0000000)==0xc0000000){// Key up A|A~$v("R  
   switch(wParam) VK}4 <u  
   { [m~J6WB  
    case VK_MENU: ~ELY$G.xl  
     MaskBits&=~ALTBIT; Lp`.fn8Ln  
     break; cx}Yu8  
    case VK_CONTROL: 3G} )$y3m  
     MaskBits&=~CTRLBIT; \j8vf0c5b  
     break;  56.!L  
    case VK_SHIFT: 16NHzAQ  
     MaskBits&=~SHIFTBIT; =]5tYIU  
     break; fHt\KP  
    default: //judge the key and send message CEy\1D  
     break; 7*:zN  
   } Pz4#>tP  
   for(int index=0;index<MAX_KEY;index++){ *D5 xbkH=.  
    if(hCallWnd[index]==NULL) yR[6s#F/h  
     continue; MBLZ:A| C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fI.|QD*$b  
    { Xfiwblg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); y:G%p3h)[  
     bProcessed=TRUE; (qn=BP I  
    } <o EAy  
   } SX4*804a_  
  } Z0gtliJ@  
  else if((lParam&0xc000ffff)==1){ //Key down A U~DbU0O  
   switch(wParam) I{Du/"r#  
   { 84ij4ZYe  
    case VK_MENU: @@d_F<Ym[  
     MaskBits|=ALTBIT; h5?^MRZS  
     break; c3]t"TA,  
    case VK_CONTROL: _!xrBdaJ  
     MaskBits|=CTRLBIT; !gh8 Qs  
     break; v^"\e&XL  
    case VK_SHIFT: B,b8\\^k|  
     MaskBits|=SHIFTBIT; ||+~8z#+,  
     break; wMS%/l0p1  
    default: //judge the key and send message ^[<BMk  
     break; /wD f,Hduz  
   } ~^wSwd[  
   for(int index=0;index<MAX_KEY;index++) Yf0 KG  
   { ch i=]*9  
    if(hCallWnd[index]==NULL) O9ex=m `L  
     continue; dT| XcVKg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^*.[b  
    { (\\;A?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *)m:u:   
     bProcessed=TRUE; o78u>Oy  
    } v9(5H Y  
   } ]r`;89:s>  
  } /x3*oO1  
  if(!bProcessed){ T zL|{9  
   for(int index=0;index<MAX_KEY;index++){ \,R;  
    if(hCallWnd[index]==NULL) ?(ORk|)kU  
     continue; -K|1w'E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Hq.rG-,p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *p/,Z2f  
   } Hf4_zd  
  } p)biOG  
 } r1!1u7dr t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^ `LqNG  
} w/@ZPBRo]  
w=KfkdAJ*/  
BOOL InitHotkey() Es>' N3A z  
{ 8eqTA8$?  
 if(hHook!=NULL){ yD"]:ts3  
  nHookCount++; =.`\V]  
  return TRUE; |[],z 8  
 } ; Z:[LJd  
 else Sk{skvd;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @a 9.s  
  if(hHook!=NULL) aRTy=~  
   nHookCount++; L{/% "2>  
  return (hHook!=NULL); s|%R  
} !Yof%%m$;  
BOOL UnInit() 7O1MC 8{  
{ AJyN lQ  
 if(nHookCount>1){ k4Q>J,k  
  nHookCount--; tW/k  
  return TRUE; !!\}-r^y%  
 } )<5k+O~  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  l"ms:v  
 if(unhooked==TRUE){ fd[N]I3  
  nHookCount=0; *RkUF!)(  
  hHook=NULL; O2fq9%lk  
 } J9lZ1,22  
 return unhooked; 3(e_2v  
} _?-oPb  
ZR1U&<0c@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z~Q=OPCnY  
{ U:8[%a  
 BOOL bAdded=FALSE; gqS9{K(f  
 for(int index=0;index<MAX_KEY;index++){ +2`BZ}5y  
  if(hCallWnd[index]==0){ !( lcUdBd  
   hCallWnd[index]=hWnd; ROFZ*@CH<  
   HotKey[index]=cKey; "3^tVX%$\[  
   HotKeyMask[index]=cMask; uZ6krI  
   bAdded=TRUE; Z3]I^i FI  
   KeyCount++; L/"MRQ"  
   break; >Y>R1b%  
  } M v6 ^('  
 } ET.jjV  
 return bAdded; t@!n?j I  
} t"$~o:U&)  
TAXsL&Tz>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BwT[SI<Sg  
{ >NUbk9}J4  
 BOOL bRemoved=FALSE; AJ7w_'u=@  
 for(int index=0;index<MAX_KEY;index++){ r *K  
  if(hCallWnd[index]==hWnd){ ZA="Dac  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c`<2&ke  
    hCallWnd[index]=NULL; D|q~n)TW5  
    HotKey[index]=0; %mC@}  
    HotKeyMask[index]=0; JY  
    bRemoved=TRUE; ZPZh6^cc  
    KeyCount--; poBeEpbs  
    break; cK'g2S  
   } M5no4P<  
  } "'CvB0>   
 } \\SQACN  
 return bRemoved;  Qxz[  
} L"ho|v9:  
:{a< ~n`  
void VerifyWindow() [|:{qQyD  
{ mI8EeMa{  
 for(int i=0;i<MAX_KEY;i++){ W_B=}lP@x  
  if(hCallWnd!=NULL){ T ipH}  
   if(!IsWindow(hCallWnd)){ _=$~l^Y[  
    hCallWnd=NULL; ]q"&V\b  
    HotKey=0; 7.29'  
    HotKeyMask=0; B_d\eD  
    KeyCount--; B''yW{  
   } >SXSrXyYX  
  } kx&JY9(&#  
 } |:S6Gp[\O  
} htB7 j(  
b d 1^  
BOOL CHookApp::InitInstance() ^{"i eVn  
{ h8(#\E  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); O}"oz3H  
 hins=AfxGetInstanceHandle(); :-{"9cgF R  
 InitHotkey(); %gmx47  
 return CWinApp::InitInstance(); P8m0]T.&x  
} oEX,\@+u  
]y {tMC  
int CHookApp::ExitInstance() $$ND]qM$M  
{ SNqSp.>-U"  
 VerifyWindow(); \~#\ [r_  
 UnInit(); 9(]_so24,  
 return CWinApp::ExitInstance(); v:SHaUS  
} ^\v]Ltd  
!sX$?P%U  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k5< n:dS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P8c_GEna  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %R$)bGT  
#if _MSC_VER > 1000 1t e^dh:Vp  
#pragma once %uo8z~+  
#endif // _MSC_VER > 1000 :Ak^M~6a5  
4PVg?  
class CCaptureDlg : public CDialog x[t?hl=:  
{ -=lm`X<:  
 // Construction ])?dqgwa  
 public: ,P <I<QYu  
  BOOL bTray; Qb@j8Xa4[  
  BOOL bRegistered; ;,-)Z|W  
  BOOL RegisterHotkey(); ]MYbx)v)  
  UCHAR cKey; Q3>qT84  
  UCHAR cMask; &3/`cl[+  
  void DeleteIcon(); k?h{ 6Qd  
  void AddIcon(); Fe[6Y<x+:  
  UINT nCount; !&OdbRHM  
  void SaveBmp(); :vi %7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !$HuH6_[  
  // Dialog Data eQQVfEvS  
  //{{AFX_DATA(CCaptureDlg) `_vPElQXZ#  
  enum { IDD = IDD_CAPTURE_DIALOG }; n^QDMyC;I  
  CComboBox m_Key; R{}_Qb  
  BOOL m_bControl; =3,<(F5Y[  
  BOOL m_bAlt; zpT{!V  
  BOOL m_bShift; 0(&uH0x  
  CString m_Path; Yaq0mef0  
  CString m_Number; 3=]/+{B  
  //}}AFX_DATA ruqE]Hx9(  
  // ClassWizard generated virtual function overrides r;f\^hVy  
  //{{AFX_VIRTUAL(CCaptureDlg) R&s/s`pLW  
 public: ? Zv5iI  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ' Sd&I:?  
 protected: f~d =1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >`3 0 ib  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Nt+UL/1]  
  //}}AFX_VIRTUAL h<m>S,@g  
  // Implementation .WOF:Nu4  
 protected: 21$^k5  
  HICON m_hIcon; Y\!:/h]E&  
  // Generated message map functions *y"|/_ *  
  //{{AFX_MSG(CCaptureDlg) >y+j!)\  
  virtual BOOL OnInitDialog(); Kc9)Lzu+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -GgV&%'a  
  afx_msg void OnPaint(); 7({.kD6  
  afx_msg HCURSOR OnQueryDragIcon(); "z.!h(Eq  
  virtual void OnCancel(); ~$a%& ]\  
  afx_msg void OnAbout(); (I`< ;  
  afx_msg void OnBrowse(); LY0/\Z"N  
  afx_msg void OnChange(); _}Gs9sHr0K  
 //}}AFX_MSG  4z|Yfvq  
 DECLARE_MESSAGE_MAP() >fR#U"KPAB  
}; (K"t</]  
#endif gp'n'K]  
Us9$,(3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F0NNS!WP7^  
#include "stdafx.h" Hi{!<e2  
#include "Capture.h" Iq": U  
#include "CaptureDlg.h" uP ?gGo  
#include <windowsx.h> `|JQ)!Agx  
#pragma comment(lib,"hook.lib") ZoC?9=k  
#ifdef _DEBUG =TI|uD6T  
#define new DEBUG_NEW }Lwj~{  
#undef THIS_FILE kqAQrg]n  
static char THIS_FILE[] = __FILE__;  K[TMTn  
#endif nBiA=+'v  
#define IDM_SHELL WM_USER+1 .Lu=16  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  WU,72g=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u= +  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; TAJ9Y<  
class CAboutDlg : public CDialog kk5i{.?[  
{ J&:0ytG  
 public: v:T` D  
  CAboutDlg(); yM D* >8/  
  // Dialog Data Y.*lO  
  //{{AFX_DATA(CAboutDlg) 2Nl("e^kJr  
  enum { IDD = IDD_ABOUTBOX }; :~)Q]G1Nj  
  //}}AFX_DATA (U dDp"/  
  // ClassWizard generated virtual function overrides cwC, VYVl  
  //{{AFX_VIRTUAL(CAboutDlg) ptq{$Y{_  
 protected: x!.VWGtb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y<.!TULa_  
  //}}AFX_VIRTUAL ujWHO$uz!  
  // Implementation K((Kd&E  
 protected: 'IW+"o  
  //{{AFX_MSG(CAboutDlg) $-AvH( @  
  //}}AFX_MSG @ :4Kk 4g1  
  DECLARE_MESSAGE_MAP() .- Lqo=o\  
}; jgo@~,5R  
MHYf8HN  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bg*{1^  
{ .nH /=  
 //{{AFX_DATA_INIT(CAboutDlg) _Usg`ax-  
 //}}AFX_DATA_INIT 9|WWA%p  
} J| '(;Ay4u  
|)-:w?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !m|%4/ M@  
{ L-R}O 8  
 CDialog::DoDataExchange(pDX); {|E7N"Qzg  
 //{{AFX_DATA_MAP(CAboutDlg) m8PB2h  
 //}}AFX_DATA_MAP dR+$7N$  
} ksaC[G;}:  
RGLA}|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) S%fBt?-Cm  
 //{{AFX_MSG_MAP(CAboutDlg) @#tSx  
 // No message handlers KxwLKaImI  
 //}}AFX_MSG_MAP UVJ(iNK"  
END_MESSAGE_MAP() ,AM-cwwT:u  
Z :+#3.4$3  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %p60pn[(  
: CDialog(CCaptureDlg::IDD, pParent) j2Y(Q/i  
{ $IT9@}*{  
 //{{AFX_DATA_INIT(CCaptureDlg) i|^6s87"N2  
  m_bControl = FALSE; <6~;-ZQY  
  m_bAlt = FALSE; 3p W MS&  
  m_bShift = FALSE; wS0bk<(  
  m_Path = _T("c:\\"); }AqD0Qd2Hj  
  m_Number = _T("0 picture captured.");  vB*oI~<  
  nCount=0; Ig KAD#2a  
  bRegistered=FALSE; %Ab_PAw  
  bTray=FALSE; >pvg0Fh  
 //}}AFX_DATA_INIT `=DCX%Vw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +:%FJCOT  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); a4RFn\4?  
} Z|% 2495\  
np^<HfYV  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Fd&!-` T?  
{ =+S3S{\CK  
 CDialog::DoDataExchange(pDX); S\;.nAR  
 //{{AFX_DATA_MAP(CCaptureDlg) k#*yhG,]'  
  DDX_Control(pDX, IDC_KEY, m_Key); \q'fB?bS^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /$,=>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); QS*cd|7J;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E}9ldM=]s  
  DDX_Text(pDX, IDC_PATH, m_Path); +|YZEC  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >?eTbtP  
 //}}AFX_DATA_MAP B!ibE<7,  
} =Fy8rTdk6r  
~"2@A F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) TeCpT2!5j  
//{{AFX_MSG_MAP(CCaptureDlg) :qTcxzV  
 ON_WM_SYSCOMMAND() O:tX0<6  
 ON_WM_PAINT() ;;hyjFGq%  
 ON_WM_QUERYDRAGICON() F(~_L.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "ak9LZQ9z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A'QGTT  
 ON_BN_CLICKED(ID_CHANGE, OnChange) S} Cp&}G{P  
//}}AFX_MSG_MAP cievC,3*  
END_MESSAGE_MAP() lN>C#e<]  
yUmsE-W  
BOOL CCaptureDlg::OnInitDialog() /NX7Vev  
{ 2qMsa>~  
 CDialog::OnInitDialog(); L2.`1Aag  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); RrdtU7i3  
 ASSERT(IDM_ABOUTBOX < 0xF000); i6#]$B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6.h   
 if (pSysMenu != NULL) <-B"|u  
 { kefv=n*]l  
  CString strAboutMenu; w1@b5-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); apD=>O  
  if (!strAboutMenu.IsEmpty()) J7wQ=! g  
  { _ c ]3nzIr  
   pSysMenu->AppendMenu(MF_SEPARATOR); q6JW@GT  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W#jZRviyq!  
  } .A7tq  
 } zB6u-4^wT  
 SetIcon(m_hIcon, TRUE); // Set big icon wYO"znd  
 SetIcon(m_hIcon, FALSE); // Set small icon m_!vIUOz  
 m_Key.SetCurSel(0); k3>ur>aW  
 RegisterHotkey(); Ryba[Fz4Di  
 CMenu* pMenu=GetSystemMenu(FALSE);  ;[KriW  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]ZKt1@4AY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yaRcBT?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); SAG` ^t  
 return TRUE; // return TRUE unless you set the focus to a control d9-mWz(V+  
} ?(/j<,m^  
FL#g9U>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]a6O(]  
{ ^/C $L8#  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;j>Vt?:Pw  
 { ?7kV+{.  
  CAboutDlg dlgAbout; ?)mhJ/IT  
  dlgAbout.DoModal(); -<51CDw,  
 } MO~~=]Y'  
 else }>;ht5/i/  
 { ..q63dr  
  CDialog::OnSysCommand(nID, lParam); `o_fUOe8a  
 } _D>as\dP  
} `?]rr0.}hp  
O| 1f^_S/  
void CCaptureDlg::OnPaint() RF4$  
{ k~1j/VHv  
 if (IsIconic()) X$-b oe?  
 { ;;YcuzQI3  
  CPaintDC dc(this); // device context for painting L`jB)wF /J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UEEBWzH  
  // Center icon in client rectangle ke}Y 2sB  
  int cxIcon = GetSystemMetrics(SM_CXICON); h eE'S/  
  int cyIcon = GetSystemMetrics(SM_CYICON); T,WKo B  
  CRect rect; Jm %ynW  
  GetClientRect(&rect); A-a17}fta  
  int x = (rect.Width() - cxIcon + 1) / 2; 8 _4l"v p  
  int y = (rect.Height() - cyIcon + 1) / 2; _oJ2]f6KX  
  // Draw the icon aJ6#=G61l  
  dc.DrawIcon(x, y, m_hIcon); VelB-vy&  
 } msc 1^2  
 else \6SMn6a4  
 { YgfSC}a  
  CDialog::OnPaint(); NV} RRs  
 } k<YtoV  
} %XJQ0CE<(  
aFRTNu/r  
HCURSOR CCaptureDlg::OnQueryDragIcon() |;A9A's  
{ *?_qE  
 return (HCURSOR) m_hIcon; YVB% kKv{  
} <I7(eh6d  
Yzj%{fkh  
void CCaptureDlg::OnCancel() IjG5X[@  
{ p-5P as  
 if(bTray) `E3:;|  
  DeleteIcon(); T!l mO?Q  
  CDialog::OnCancel(); `*e4m  
} bKk CW  
@72x`&|I?u  
void CCaptureDlg::OnAbout() N@Xg5huO  
{ ";PG%_(  
 CAboutDlg dlg; &sm @  
 dlg.DoModal();  d?:`n 9`  
} |x &Z~y  
2X|CuL{]  
void CCaptureDlg::OnBrowse() 6xQ"bFm  
{ O6y @G .+  
 CString str; paW'R+Rck  
 BROWSEINFO bi; 9v~1We;{$  
 char name[MAX_PATH]; pO"m~mpA  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7{n\y l?  
 bi.hwndOwner=GetSafeHwnd(); OuB2 x=B  
 bi.pszDisplayName=name;  bt;lq!g  
 bi.lpszTitle="Select folder"; W`#gpi)7N  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; sf Dg/ a  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ! L4dUMo  
 if(idl==NULL) \). Nag+  
  return; <z^SZ~G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }%eDEM  
 str.ReleaseBuffer(); @. "q  
 m_Path=str; ~6p5H}'H1  
 if(str.GetAt(str.GetLength()-1)!='\\') __ 8&Jv\  
  m_Path+="\\"; j7f5|^/x3  
 UpdateData(FALSE); 1|W2s\  
} F4Rr26M  
f, |QAj=a  
void CCaptureDlg::SaveBmp() I?^aCnU  
{ $h,d? .u6w  
 CDC dc; neF8V"-u&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eaEbH2J  
 CBitmap bm; u[)_^kIE(n  
 int Width=GetSystemMetrics(SM_CXSCREEN); bn$)f6%  
 int Height=GetSystemMetrics(SM_CYSCREEN); A*hZv|$0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]*0(-@  
 CDC tdc; vyE{WkZxR  
 tdc.CreateCompatibleDC(&dc); 2zhn`m  
 CBitmap*pOld=tdc.SelectObject(&bm); L/~D<V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *\D}eBd|  
 tdc.SelectObject(pOld); jDkm:X}:  
 BITMAP btm; GSP?X$E  
 bm.GetBitmap(&btm); J<rlz5':  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; C#0brCQq3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Wj&nUp{  
 BITMAPINFOHEADER bih; xWDR72 6  
 bih.biBitCount=btm.bmBitsPixel; n!ZMTcK8  
 bih.biClrImportant=0; 0 <g{ V  
 bih.biClrUsed=0; K!p,x;YX  
 bih.biCompression=0; WVOoHH  
 bih.biHeight=btm.bmHeight; Yr=8!iR$  
 bih.biPlanes=1; ^+wk  
 bih.biSize=sizeof(BITMAPINFOHEADER); s"WBw'_<<  
 bih.biSizeImage=size; z|I0-1tAK  
 bih.biWidth=btm.bmWidth; }-74 f  
 bih.biXPelsPerMeter=0; 2 L:$aZ  
 bih.biYPelsPerMeter=0; D^|9/qm$  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); a$}NW.  
 static int filecount=0; tF^g<)S;t  
 CString name; ->h5T%sn  
 name.Format("pict%04d.bmp",filecount++); \%TyrY+`K  
 name=m_Path+name; ya.n'X14  
 BITMAPFILEHEADER bfh; J'e]x[Y  
 bfh.bfReserved1=bfh.bfReserved2=0; V#L'7">VP  
 bfh.bfType=((WORD)('M'<< 8)|'B'); W qE '(  
 bfh.bfSize=54+size; &))\2pl  
 bfh.bfOffBits=54; 6J\fF tB@V  
 CFile bf; <!F3s`7~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,5{$+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -9d%+O~v6~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); GJ,a RI  
  bf.WriteHuge(lpData,size); hO3 {  
  bf.Close(); rEM#D]k  
  nCount++; {n&Uf{  
 } L5f$TLw h;  
 GlobalFreePtr(lpData); w"~<h;  
 if(nCount==1) 2 x32U MD  
  m_Number.Format("%d picture captured.",nCount); '1-maM\r  
 else f@d9Hqr+l;  
  m_Number.Format("%d pictures captured.",nCount); g*J@[y;  
  UpdateData(FALSE); `eR 7H>I  
} Xb,T{.3@  
s$ z2 c  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9->q|E4  
{ >g}G}=R~3  
 if(pMsg -> message == WM_KEYDOWN) -ihiG_f  
 { v+6e;xl8  
  if(pMsg -> wParam == VK_ESCAPE) |>+uw|LtZ  
   return TRUE; #K|9^4jt  
  if(pMsg -> wParam == VK_RETURN) wd+K`I/v7h  
   return TRUE; z_&P?+"Df  
 } Ilq=wPD}j  
 return CDialog::PreTranslateMessage(pMsg); IPtvuEju\  
} IZrk1fh  
FnE6?~xa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y3rt5\!  
{ J'Sm0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !MV@) (.  
  SaveBmp(); !0" nx{7.  
  return FALSE; izuF !9  
} =;ICa~`C;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *eb-rhCVn  
 CMenu pop; BC77<R!E)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v&;:^jJ8  
 CMenu*pMenu=pop.GetSubMenu(0); (MLhaux-  
 pMenu->SetDefaultItem(ID_EXITICON); s&Yi 6:J  
 CPoint pt; @ D[`Oj)  
 GetCursorPos(&pt); y{=>$C[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ,:GN;sIXg  
 if(id==ID_EXITICON) uQ3[Jz`y  
  DeleteIcon(); RUo9eQIPD  
 else if(id==ID_EXIT) %l !xkCKA  
  OnCancel(); J2M(1g)t9  
 return FALSE; Mvcfk$pA  
} |.U)ll(c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3)N\'xFh@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g0&\l}&%U  
 AddIcon(); ~ ?^/u8  
 return res; 7o]HQ[xO  
} WNy3@+@GZ  
r{K;|'d%h  
void CCaptureDlg::AddIcon() |yY`s6Uq  
{ ,wj"! o#  
 NOTIFYICONDATA data; }NCL>l;q  
 data.cbSize=sizeof(NOTIFYICONDATA); ~Xv=9@,h  
 CString tip; lpm JLH.F  
 tip.LoadString(IDS_ICONTIP); iiC!|`k"  
 data.hIcon=GetIcon(0); *hY2.t; X  
 data.hWnd=GetSafeHwnd();  jNyoN1M  
 strcpy(data.szTip,tip); 1hmc,c  
 data.uCallbackMessage=IDM_SHELL; E"PcrWB&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; MaY682}|y  
 data.uID=98; V5mTu)tp5  
 Shell_NotifyIcon(NIM_ADD,&data); p,W_'?,9  
 ShowWindow(SW_HIDE); @N.jB#nEb  
 bTray=TRUE; k$i'v:c|:i  
} m$2<`C=  
.*/Fucr  
void CCaptureDlg::DeleteIcon() TnH\O$  
{ 9pSUIl9|j  
 NOTIFYICONDATA data; |U' I/A  
 data.cbSize=sizeof(NOTIFYICONDATA); b[ w;i]2  
 data.hWnd=GetSafeHwnd(); n.}T1q|l  
 data.uID=98; Y] g?2N=E  
 Shell_NotifyIcon(NIM_DELETE,&data); XNH4vG |  
 ShowWindow(SW_SHOW); !{%:qQiA  
 SetForegroundWindow(); dJk9@u  
 ShowWindow(SW_SHOWNORMAL); i@P}{   
 bTray=FALSE; 5K%W a]W  
} YwDt.6(+,  
WcUJhi^\C  
void CCaptureDlg::OnChange() b^CNVdo'  
{ ~/#1G.H  
 RegisterHotkey(); 8Cx^0  
} YK#fa2ng  
0y#Ih {L  
BOOL CCaptureDlg::RegisterHotkey() m_NCx]#e   
{ M[]A2'fS  
 UpdateData(); ^s:y/Kd  
 UCHAR mask=0; Lxl_"k G  
 UCHAR key=0; ] ZoPQUS?  
 if(m_bControl) t#E}NR  
  mask|=4; 2-+f1,  
 if(m_bAlt) A<MtKb  
  mask|=2; IVxWxM*N<  
 if(m_bShift) 2tQ`/!m>v$  
  mask|=1; &:#h$`4  
  key=Key_Table[m_Key.GetCurSel()]; hVpCB,  
 if(bRegistered){ JCniN";r[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vIGw6BJI  
  bRegistered=FALSE; B 9dt=j3j2  
 } ?\=/$Gt  
 cMask=mask;  k+ o|0  
 cKey=key; mh/n.*E7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3,X/,'  
 return bRegistered; ?)4?V\$  
} W&Y"K)`  
f:JlZ&  
  四、小结 rJyCw+N0  
g{k1&|  
  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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