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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: i G?w;  
  })h'""i&xn  
  一、实现方法 17?NR\Q  
7] R6  
  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: UXXqE4x  
bgkbwE  
#pragma data_seg("shareddata") yL^M~lws  
HHOOK hHook =NULL; //钩子句柄 >^2ZM  
UINT nHookCount =0; //挂接的程序数目 e/g<<f-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Nn~tb2\vk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `HMligT  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &6=TtTp"9  
static int KeyCount =0; Q%_!xQP`  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E,"b*l.  
#pragma data_seg() :..E:HdYO  
ljaAB+  
  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。 UtHmM,*I  
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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: "H/2r]?GT  
D~[ N_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |:J*>"sq  
cKey,UCHAR cMask) <ls i.x\y<  
{ rF <iWM=  
 BOOL bAdded=FALSE; 6z%&A]6k:  
 for(int index=0;index<MAX_KEY;index++){ N?Z+zN&P  
  if(hCallWnd[index]==0){ U~JG1#z6  
   hCallWnd[index]=hWnd; >n@>h$]  
   HotKey[index]=cKey; 2 `q^Q  
   HotKeyMask[index]=cMask; 7N-CtQnv  
   bAdded=TRUE; t6! p\Y}}  
   KeyCount++; R(n0!h4  
   break; $Sc08ro  
  } M4L~bK   
 } 83p$!8]u  
 return bAdded; s~IA},F,\  
}  h;:Se  
//删除热键 g(z#h$@S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q}k_#w  
{ 7k[`]:*o  
 BOOL bRemoved=FALSE; dd @COP?  
 for(int index=0;index<MAX_KEY;index++){ +w_MSj#P  
  if(hCallWnd[index]==hWnd){ J"a2 @S&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8 H$@Xts  
    hCallWnd[index]=NULL; kOlI?wc  
    HotKey[index]=0; GSUOMy[M-  
    HotKeyMask[index]=0; @ B}c4,  
    bRemoved=TRUE; [|m>vY!  
    KeyCount--; @h z0:ezg:  
    break; _mI:Lr#dT  
   } KqG$zC^N  
  } ` i^`Q  
 } ?()E5 4y  
 return bRemoved; ]ZU:%Qhu  
} KY(l<pm  
[W8iM7D  
(pRy1DH~  
  DLL中的钩子函数如下: Rzn0-cG  
8gu7f;H/k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #7cf 8y  
{ M7cI$=G  
 BOOL bProcessed=FALSE; '6Z/-V4k  
 if(HC_ACTION==nCode) Xbsj:Ko]]U  
 { A<*tn?M]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 tZc.%TU  
   switch(wParam) 3ec==.  
   {  Nsy9 h}+A  
    case VK_MENU: z? b(|f\!  
     MaskBits&=~ALTBIT; ADwwiq#E  
     break; p1`'1`.3  
    case VK_CONTROL: gen3"\Og{  
     MaskBits&=~CTRLBIT; f@x( ,p  
     break; E}CqVuU$  
    case VK_SHIFT: J?HZ,7X:  
     MaskBits&=~SHIFTBIT; +-KRp1qq  
     break; <}x|@u  
    default: //judge the key and send message MIMPJXT#.  
     break; )MX1776kU  
   } 1dgN10  
   for(int index=0;index<MAX_KEY;index++){ %lqG*dRx0  
    if(hCallWnd[index]==NULL) X G@>1/  
     continue; pN^G[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aGzdur  
    { VHXR)}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $4ZDT]n  
     bProcessed=TRUE; m= beB\=  
    } _QtQPK\+  
   } s'fcAh,c6  
  } ,a?\i JNb  
  else if((lParam&0xc000ffff)==1){ //有键按下 q_m#BE;t  
   switch(wParam) WTy8N  
   { e[VJ0 A=  
    case VK_MENU: /v5g;x_T  
     MaskBits|=ALTBIT; JD\-X(O  
     break; ;]`NR  
    case VK_CONTROL: 3Jk?)D y  
     MaskBits|=CTRLBIT; :N'[d e  
     break; h}VYA\+<B  
    case VK_SHIFT: l.W1$g  
     MaskBits|=SHIFTBIT; x.4)p6  
     break; ` a<|CcUGU  
    default: //judge the key and send message @0@'6J04  
     break; "=5vgg3  
   } `efH(  
   for(int index=0;index<MAX_KEY;index++){ hcqmjqJ  
    if(hCallWnd[index]==NULL) .qU%SmQ^  
     continue; Dm`U|<o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [ QL<&:s&  
    { HuLm!tCu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `5 v51TpH  
     bProcessed=TRUE; 9QM"JEu@  
    } :Tl6:=B  
   }  sCf(h  
  } kpMM%"=V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }mS0{rxD4  
   for(int index=0;index<MAX_KEY;index++){ 1X:whS5S  
    if(hCallWnd[index]==NULL) A,CPR0g%  
     continue; 0{Ll4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pUEok+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0dX=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ';L^mxh  
   } O=?X%m #  
  } ?Dp^dR  
 } |h~/Zz=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /v ;Kb|e  
} a0W\?  
)cmLo0`$  
  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: kp>Z/kt  
36Y[7 m=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aiX;D/t?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r`"#c7)  
/WgWe  
  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: T|iF/p]F  
-v+^x`HR  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) BNm va  
{ Ol5xyj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) umn~hb5O  
 { )PATz #  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Kxaz^$5Y$  
  SaveBmp(); -/{}^ QWB  
  return FALSE; &``oZvu B  
 } Jt, 4@  
 …… //其它处理及默认处理 s=@Ce V@4W  
} Ewsg&CCN  
I\6<)2j/L  
DT]p14@t9  
  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。 :mHtK)z~  
S7>gNE;%]u  
  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。 [k{iN1n  
Lj1 @yokB  
  二、编程步骤 '9Odw@tp  
.`#R%4Xl  
  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"; `-YSFQ~O,  
DN{G$$or  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; x{o5Ha{  
[jn;| 3  
  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; +\$|L+@Z  
,ST.pu8N.  
  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; M@@O50~  
oi4Wxcj  
  5、 添加代码,编译运行程序。 _Vf|F  
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三、程序代码 fhWD>;%F%  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL u9~J1s<e  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  y, _3Ks  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ AFUl   
#if _MSC_VER > 1000 R*fR?  
#pragma once myX0<j3G5  
#endif // _MSC_VER > 1000 >^HTghgRD  
#ifndef __AFXWIN_H__ w:+#,,rwzV  
#error include 'stdafx.h' before including this file for PCH Bzt`9lg  
#endif E }j8p_p  
#include "resource.h" // main symbols r:rJv  
class CHookApp : public CWinApp _VJwC|  
{ /\I%)B47^9  
 public: O!Cu.9}  
  CHookApp(); RteTz_ z{  
  // Overrides |Cq J2  
  // ClassWizard generated virtual function overrides eH*b -H[  
  //{{AFX_VIRTUAL(CHookApp) `bF;Ew;  
 public: =_6h{f&Q  
  virtual BOOL InitInstance(); &bK$!8Z  
  virtual int ExitInstance(); rM.<Gi05Qe  
  //}}AFX_VIRTUAL FQ1oqqr  
  //{{AFX_MSG(CHookApp) *lF%8k"Al  
  // NOTE - the ClassWizard will add and remove member functions here. 3(p6ak2lv  
  // DO NOT EDIT what you see in these blocks of generated code ! !_!b \  
  //}}AFX_MSG VjM uU"++@  
  DECLARE_MESSAGE_MAP() 4ux5G`oL  
}; <t@*[Aw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ID+k`nP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Mwk_S Cy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +Z]%@"S?  
BOOL InitHotkey(); DQnWLC"u  
BOOL UnInit(); _oVA0@#n  
#endif ?{")Wt  
=@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T^G<)IX`c  
#include "stdafx.h" N\&;R$[9:  
#include "hook.h" MX\-)e#  
#include <windowsx.h> W/Q%%)J  
#ifdef _DEBUG Ls*=mh~IY  
#define new DEBUG_NEW 2=+ ,jX{  
#undef THIS_FILE EIm\!'R]  
static char THIS_FILE[] = __FILE__; R?SHXJ%'  
#endif cLP @0`^H  
#define MAX_KEY 100 %;?3A#  
#define CTRLBIT 0x04 Z`t?kXDNoI  
#define ALTBIT 0x02 1=.kH[R  
#define SHIFTBIT 0x01 0E1)&f  
#pragma data_seg("shareddata") +[9"M+4-  
HHOOK hHook =NULL; XLxr~Yo  
UINT nHookCount =0; S,%HW87  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey S`KCVQ>V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }dl(9H=4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey RL9BB.  
static int KeyCount =0; ^u,x~nPXg  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  '|T=  
#pragma data_seg() OG`O i^2  
HINSTANCE hins; 0VPa;{i/  
void VerifyWindow(); zy;w07-)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u;}B4Rx  
//{{AFX_MSG_MAP(CHookApp) S}O\<6&  
// NOTE - the ClassWizard will add and remove mapping macros here. u)pBFs<dn  
// DO NOT EDIT what you see in these blocks of generated code! czRh.kz,  
//}}AFX_MSG_MAP AFED YRX  
END_MESSAGE_MAP() .x%SbG<k{  
T,>e\  
CHookApp::CHookApp() 4*W7{MPY  
{ 4iW 2hV@m  
 // TODO: add construction code here, [_@OCiV5)  
 // Place all significant initialization in InitInstance *[n^6)  
} a-y5\x  
*JXJ 2  
CHookApp theApp; P s;:g0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TKX#/  
{ ^+<uHd>  
 BOOL bProcessed=FALSE; .`].\Zykf  
 if(HC_ACTION==nCode) _R6> Ayw*  
 { 1[]cMyV  
  if((lParam&0xc0000000)==0xc0000000){// Key up DUr1s]+P  
   switch(wParam) Km-B=6*QY  
   { _jz=BRO$  
    case VK_MENU: < .!3yy  
     MaskBits&=~ALTBIT; iN*@f8gf  
     break; bP@ _4Dy  
    case VK_CONTROL: bHnQLJ  
     MaskBits&=~CTRLBIT; 1 Y& d%AA  
     break; R&0l4g-4>  
    case VK_SHIFT: Y~xZ{am  
     MaskBits&=~SHIFTBIT; 2Oa-c|F  
     break; 6 -}gqkR  
    default: //judge the key and send message |?kH]Trr  
     break; r~! lD9R~  
   } 9n'p7(s%  
   for(int index=0;index<MAX_KEY;index++){ {9MYEN}FO  
    if(hCallWnd[index]==NULL) 1-#tx*>AY  
     continue;  tS7u#YMh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3F1Z$d(  
    { KK6YA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?Dm&A$r  
     bProcessed=TRUE; qfU3Cwy  
    } }d(6N&;"zN  
   } ]u';zJ.  
  } ]'q<wPi  
  else if((lParam&0xc000ffff)==1){ //Key down YBP{4Rl  
   switch(wParam) pxj"<q`nw8  
   { e)kf;Hkf  
    case VK_MENU: /slML~$t<  
     MaskBits|=ALTBIT; 9@06]EI_  
     break; ,R+u%bmn#  
    case VK_CONTROL: =F4}  
     MaskBits|=CTRLBIT; 1F|+4  
     break; UsTPNQj  
    case VK_SHIFT: /rW{rf^  
     MaskBits|=SHIFTBIT; <4g^c&  
     break; S SXSgp  
    default: //judge the key and send message E_oe1C:  
     break; %`'VXR?`h=  
   } :y)'qv[  
   for(int index=0;index<MAX_KEY;index++) FcA0 \`0M  
   { p* @L1  
    if(hCallWnd[index]==NULL) *)<tyIHd  
     continue; 5z _)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +,lD_{}_  
    { LHb{9x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); QS}=oOR@k  
     bProcessed=TRUE; D }\`5L<  
    } Ar==@777j  
   } g i)/iz`  
  } heWb(E&  
  if(!bProcessed){ ,l6W|p?ZO^  
   for(int index=0;index<MAX_KEY;index++){ KB5{l%>  
    if(hCallWnd[index]==NULL) |zMQe}R@%  
     continue; 8~i@7~ J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VA0TY/{ ]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (`xc3-,  
   } _OY;SJ(  
  } Lj H];=R  
 } N+\*:$>zt6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); abND#t  
} [H6>]&  
S,H{\c  
BOOL InitHotkey() s@$AYZm_  
{ >BX_Bou  
 if(hHook!=NULL){ 1 wG1\9S  
  nHookCount++; llzl-2` /  
  return TRUE; #lO;G k{  
 } ?P5D!b:(  
 else fHigLL0B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \&H%k   
  if(hHook!=NULL) 0`W~2ai  
   nHookCount++; OjN]mp-q  
  return (hHook!=NULL); !4E:IM63  
} xn"g_2Hi  
BOOL UnInit() ^tv*I~>J!  
{ {x8`gP\H  
 if(nHookCount>1){ XP7A.I#q0  
  nHookCount--; 2B4c :jJ  
  return TRUE; &eg,*K}'  
 } 4Qv|Z+$i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `Ao: }  
 if(unhooked==TRUE){ >HFJm&lQ  
  nHookCount=0; 3{ci]h`:y8  
  hHook=NULL; 1jL?z6S  
 } 1pV"< ,t  
 return unhooked; R/#*~tPi8  
} MWl@smRh  
tT7$2 9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iB?@(10}ES  
{ Bg`b*(Q  
 BOOL bAdded=FALSE; 78%2#;;G  
 for(int index=0;index<MAX_KEY;index++){ 8<^,<?  
  if(hCallWnd[index]==0){ r (uM$R$o  
   hCallWnd[index]=hWnd; Pc3u`QL?  
   HotKey[index]=cKey; 2C-u2;X2  
   HotKeyMask[index]=cMask; d^w_rL  
   bAdded=TRUE; BWs\'B  
   KeyCount++; rLwc=(|  
   break; ; H3kb +  
  } #'T|,xIr-Q  
 } /$n${M5!  
 return bAdded; 1Jahu!c?  
} 8.,PgS  
SBEJ@&iB~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BjH(E'K[b  
{  en   
 BOOL bRemoved=FALSE; $OT:J  
 for(int index=0;index<MAX_KEY;index++){ H.9J}k1S  
  if(hCallWnd[index]==hWnd){ gor6c3i  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ' 9,}N:p  
    hCallWnd[index]=NULL; @.})nU  
    HotKey[index]=0; lY1m%  
    HotKeyMask[index]=0; oqj3Q 1  
    bRemoved=TRUE; C?B7xK  
    KeyCount--; pTTif|c  
    break; 9$_}E`  
   } eE&F1|8  
  } {?C7BClB  
 } {e~d^^N5  
 return bRemoved; Xm*Dh#H  
} 1kpI?Plki  
/'I/sWEV  
void VerifyWindow() <W?,n%  
{ ZGf=/Ra a  
 for(int i=0;i<MAX_KEY;i++){ Bq!P.%6p4  
  if(hCallWnd!=NULL){ S2*:]pYf}  
   if(!IsWindow(hCallWnd)){ 8ZN J}  
    hCallWnd=NULL; MT9a1 >  
    HotKey=0; R+m{nO~r  
    HotKeyMask=0; 0QGl'u{F  
    KeyCount--;  *) wp  
   } b#P8Je`;9  
  } &L/ C:<.  
 } [p <L*3<  
} GL/\uq  
y|@^0]}%<  
BOOL CHookApp::InitInstance() Ki'EO$  
{ @1>83-p"X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); w qsPGkJJ7  
 hins=AfxGetInstanceHandle(); S&VN</p  
 InitHotkey(); ]\jhtC=2  
 return CWinApp::InitInstance(); J@Li*Ypo  
} vH?/YhH|  
RH`m=?~J,  
int CHookApp::ExitInstance() KAe) X_R7  
{ l"cYW9  
 VerifyWindow(); y,%w`  
 UnInit(); v9<p@GY"\  
 return CWinApp::ExitInstance(); GJ*AyYG  
} mV;7SBoT  
B^6P 6,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2<y -cQ?>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Yux7kD\c  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (s9?#t6  
#if _MSC_VER > 1000 46 77uy  
#pragma once S`J_}>  
#endif // _MSC_VER > 1000 BFMM6-Ve  
'aCnj8B  
class CCaptureDlg : public CDialog _-D(N/  
{ ic3qb<2  
 // Construction ALKhZFuz  
 public: (Q @m;i>  
  BOOL bTray; o]]Q7S=  
  BOOL bRegistered; Qc3 !FW<26  
  BOOL RegisterHotkey(); [0 W^|=#K  
  UCHAR cKey; eo@:@O+bm  
  UCHAR cMask; M5<5 (l  
  void DeleteIcon(); rp _G.C  
  void AddIcon(); X=DJOepH'  
  UINT nCount; *fjarZu  
  void SaveBmp(); UP,(zKTA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor '8}\! i&  
  // Dialog Data cd:O@)i  
  //{{AFX_DATA(CCaptureDlg) AD8~  
  enum { IDD = IDD_CAPTURE_DIALOG }; >`6^1j(3  
  CComboBox m_Key; g'mkhF(  
  BOOL m_bControl; lRO4- y  
  BOOL m_bAlt; YKk%lZ.8  
  BOOL m_bShift; ln3.TR*  
  CString m_Path; d 5Il0sG  
  CString m_Number; ?"L>jr(  
  //}}AFX_DATA 9 /9,[A  
  // ClassWizard generated virtual function overrides Tp9LBF  
  //{{AFX_VIRTUAL(CCaptureDlg) x[)S3U J  
 public: =P5SFMPN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); z\;kjI  
 protected: (V |P6C  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K[ylyQ1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p,xM7V"O)  
  //}}AFX_VIRTUAL j Sddjs  
  // Implementation oXGf#>keg  
 protected: $+?6U  
  HICON m_hIcon; 0|HhA,u  
  // Generated message map functions D]4?UL  
  //{{AFX_MSG(CCaptureDlg) #M_QSD}&  
  virtual BOOL OnInitDialog(); a5&wS@) ;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {B[i|(xQx  
  afx_msg void OnPaint(); Vv zd>yII  
  afx_msg HCURSOR OnQueryDragIcon(); 6H3_q x  
  virtual void OnCancel(); z9VQsC'K  
  afx_msg void OnAbout(); P{);$e+b~  
  afx_msg void OnBrowse(); \0b ",|"3  
  afx_msg void OnChange(); eNXpRvY  
 //}}AFX_MSG E fqa*,k  
 DECLARE_MESSAGE_MAP() c>]_,Br~  
}; mNV4"lNR  
#endif ka]n+"~==\  
y{kXd1,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (2%C% #]8  
#include "stdafx.h" O *jNeYA  
#include "Capture.h" A]R"C:o  
#include "CaptureDlg.h" BL]^+KnP  
#include <windowsx.h> S?D2`b  
#pragma comment(lib,"hook.lib") |Q7Ch]G  
#ifdef _DEBUG (s}9N   
#define new DEBUG_NEW  *A_  
#undef THIS_FILE A@`C<O ^  
static char THIS_FILE[] = __FILE__; @GGyiK@  
#endif d *H-l3N  
#define IDM_SHELL WM_USER+1 8o~\L= l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _msDf2e9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !4 6 ^}3  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; b#$:XS  
class CAboutDlg : public CDialog 4$_8#w B1&  
{ 'o5[ :=K  
 public: LxMOs Nv  
  CAboutDlg();  gs9f2t  
  // Dialog Data GF k?Qf{u  
  //{{AFX_DATA(CAboutDlg) !vG._7lPp  
  enum { IDD = IDD_ABOUTBOX }; >.B+xn =  
  //}}AFX_DATA 6.ap^9AD  
  // ClassWizard generated virtual function overrides n+xM))  
  //{{AFX_VIRTUAL(CAboutDlg) 71wyZJ  
 protected: bk5~t'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sX@e1*YE_  
  //}}AFX_VIRTUAL dLjT^ 9  
  // Implementation _I@dt6oF  
 protected: +LrW#K;  
  //{{AFX_MSG(CAboutDlg) B[y1RI|9  
  //}}AFX_MSG K5k,47"  
  DECLARE_MESSAGE_MAP() ukri7 n*  
}; @^`-VF  
/ZD/!YD&R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ay4|N!ExO  
{ 5nEvnnx0  
 //{{AFX_DATA_INIT(CAboutDlg) QAX+oy  
 //}}AFX_DATA_INIT 1)k))w9  
} G|H\(3hHLZ  
g |2D(J  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #&DJ3(T  
{ ,$CZ (GQ  
 CDialog::DoDataExchange(pDX); .%D] z{''  
 //{{AFX_DATA_MAP(CAboutDlg) FSH6C2  
 //}}AFX_DATA_MAP }~\J7R'  
} >O~xu^N?  
js2?t~E]  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8lbNw_U  
 //{{AFX_MSG_MAP(CAboutDlg) p%j@2U  
 // No message handlers _gU [FUBtJ  
 //}}AFX_MSG_MAP Ih"f98lV  
END_MESSAGE_MAP() ^gv)[  
]jM D'vg^b  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) KxiZx I  
: CDialog(CCaptureDlg::IDD, pParent) M"~B_t,Nw  
{ &0Nd9%>  
 //{{AFX_DATA_INIT(CCaptureDlg) /@on=~  
  m_bControl = FALSE; ZVda0lex&  
  m_bAlt = FALSE; 6`EyzB%.$  
  m_bShift = FALSE; }<S|_F  
  m_Path = _T("c:\\"); &4DvZq=  
  m_Number = _T("0 picture captured."); Hjlx,:'M  
  nCount=0; y<B "  
  bRegistered=FALSE; R[o KhU  
  bTray=FALSE; ' Bdvqq  
 //}}AFX_DATA_INIT {K:/(\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 h j9 b Mj  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); I8?egDkk  
} 6:QJ@j\  
GY0<\-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r?H {Y3 ,  
{ 4?8GK  
 CDialog::DoDataExchange(pDX); )v'3pTs2  
 //{{AFX_DATA_MAP(CCaptureDlg) DfqXw^BKD  
  DDX_Control(pDX, IDC_KEY, m_Key); tjYe82  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~*G I<n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); +)ro EJ_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Xa%Z0% {  
  DDX_Text(pDX, IDC_PATH, m_Path); $^`hu%s,~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #Etz}:%W  
 //}}AFX_DATA_MAP c[ =9Z;|  
} !07$aQYcd  
e3',? 5j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "BEU%,w  
//{{AFX_MSG_MAP(CCaptureDlg) >>&~;PG[  
 ON_WM_SYSCOMMAND() [<OMv9(l'o  
 ON_WM_PAINT() }8 ,b; Q  
 ON_WM_QUERYDRAGICON() !'n+0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Qg1LT8  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2R.YHj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4|x5-m+T  
//}}AFX_MSG_MAP \b~zyt6-  
END_MESSAGE_MAP() - !7QH'  
VSM%<-iQ  
BOOL CCaptureDlg::OnInitDialog() |h8C}P&Z  
{ m|e!1_ :H  
 CDialog::OnInitDialog(); 6V!yfps)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E&]S No<  
 ASSERT(IDM_ABOUTBOX < 0xF000); %_} #IS1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e@@kTny(  
 if (pSysMenu != NULL) "<bL-k*H)  
 { gTiDV{ Ip  
  CString strAboutMenu; Ho*S >Y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }|Cw]GW  
  if (!strAboutMenu.IsEmpty()) 7?p%~j  
  { ^oaG.)3  
   pSysMenu->AppendMenu(MF_SEPARATOR); +U@P+;  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i Ri1E;  
  } m;8_A|$A  
 } )V~<8/)  
 SetIcon(m_hIcon, TRUE); // Set big icon <9B43  
 SetIcon(m_hIcon, FALSE); // Set small icon *}3~8fu{  
 m_Key.SetCurSel(0); us$~6  
 RegisterHotkey(); )FE'#\  
 CMenu* pMenu=GetSystemMenu(FALSE); <@e6zQG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]+ug:E{7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F;`es%8  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )p ,-TtV  
 return TRUE; // return TRUE unless you set the focus to a control hoeOdWI pf  
} hnH:G`[F  
/C_O/N  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;LthdY()n(  
{ O^|,Cbon6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) C+O`3wPZp  
 { nn5S7!  
  CAboutDlg dlgAbout; B.|2w  
  dlgAbout.DoModal(); 4Uz6*IQNl  
 } (\#j3Y)r  
 else dzggl(  
 { EGU? 54  
  CDialog::OnSysCommand(nID, lParam); V?5QpBK I  
 } gXs@FhR0  
} &)<]AG.vd!  
G;wv.|\  
void CCaptureDlg::OnPaint() vg *+>lbA  
{ et/mfzV  
 if (IsIconic()) 2{#*z%|z  
 { m6aoh^I  
  CPaintDC dc(this); // device context for painting -mcLT@  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Po93&qE  
  // Center icon in client rectangle $;"@;Lj%,  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,_P(!7Z8  
  int cyIcon = GetSystemMetrics(SM_CYICON); ml\7JW6Rx  
  CRect rect; A~O 'l&KB  
  GetClientRect(&rect); 5|Vb)QBv%  
  int x = (rect.Width() - cxIcon + 1) / 2; o %Pi;8  
  int y = (rect.Height() - cyIcon + 1) / 2; >8 VfijK  
  // Draw the icon \ssuO  
  dc.DrawIcon(x, y, m_hIcon); <&b ~(f  
 } @q[-,EA9  
 else KiH#*u S  
 { gO_^{>2  
  CDialog::OnPaint(); I3s'44  
 } `hI1  
} jAN(r>zVL  
l.fNkLC#  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;k(|ynXv  
{ ~d){7OG  
 return (HCURSOR) m_hIcon; ) Q~Q .  
} 5N`g  
Br1JZHgA  
void CCaptureDlg::OnCancel() F_\\n#bv  
{ tgc&DT; E  
 if(bTray) 7s>d/F3*  
  DeleteIcon(); 9`-ofwr'|  
  CDialog::OnCancel(); ]^ZC^z;H  
} 2|w(d  
D[:7B:i  
void CCaptureDlg::OnAbout() Qt]nlui~  
{ iTqv=  
 CAboutDlg dlg; s13Iu#  
 dlg.DoModal(); m S!/>.1[  
} +~8/7V22  
YWd:Ok0  
void CCaptureDlg::OnBrowse() D;d 'ss;  
{ f5mk\^  
 CString str; gd#  
 BROWSEINFO bi; %Xkynso~  
 char name[MAX_PATH]; K31Fp;K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -V_e=Y<J/  
 bi.hwndOwner=GetSafeHwnd(); >L[,.}(9  
 bi.pszDisplayName=name; QF!K$?EU[  
 bi.lpszTitle="Select folder"; *l_1T4]S  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  2Np9*[C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0z.`  
 if(idl==NULL) x/bO;9E%U4  
  return; AUzJ:([V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q'",70"\  
 str.ReleaseBuffer(); bZERh:%o  
 m_Path=str; PN+,M50;1  
 if(str.GetAt(str.GetLength()-1)!='\\') Eu1s  
  m_Path+="\\"; -}PD0Pzg;=  
 UpdateData(FALSE); >d#B149  
} M /Bn^A8@  
pd>EUdbrp&  
void CCaptureDlg::SaveBmp() BU]9eF!>h  
{ ;)c SdA9  
 CDC dc; >SSF:hI"J  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4'G<qJoc  
 CBitmap bm; Lr40rLx;u  
 int Width=GetSystemMetrics(SM_CXSCREEN); Gd:fWz(  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;y4 "wBX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); oA_AnD?G+  
 CDC tdc; sN^R Z0!>  
 tdc.CreateCompatibleDC(&dc); @iao"&  
 CBitmap*pOld=tdc.SelectObject(&bm); ]5rEwPB  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); DV{Qbe#In  
 tdc.SelectObject(pOld); B7N?"'$i  
 BITMAP btm; EDL<J1%  
 bm.GetBitmap(&btm); /!jn$4fd:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9QWS[E4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;t[<!  
 BITMAPINFOHEADER bih; +#'exgGU^[  
 bih.biBitCount=btm.bmBitsPixel; a+r0@eFLc  
 bih.biClrImportant=0; ;h0?o*i_  
 bih.biClrUsed=0; PNg,bcl  
 bih.biCompression=0; GS< ,adD  
 bih.biHeight=btm.bmHeight;  =Lp0i9c  
 bih.biPlanes=1; ^J@Y?CQl\  
 bih.biSize=sizeof(BITMAPINFOHEADER); wR>\5z )^  
 bih.biSizeImage=size; b`18y cVME  
 bih.biWidth=btm.bmWidth; HO & #Lv  
 bih.biXPelsPerMeter=0; xxiEL2"`>  
 bih.biYPelsPerMeter=0; 8~}Ti*Urc  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); sE-"TNONZ  
 static int filecount=0; {.Nt#l  
 CString name; w9i1ag  
 name.Format("pict%04d.bmp",filecount++); t4F1[P  
 name=m_Path+name; ]UFf-  
 BITMAPFILEHEADER bfh; 7NoB   
 bfh.bfReserved1=bfh.bfReserved2=0; 0dXZd2oK@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xqM R[W\x  
 bfh.bfSize=54+size; A3M)yWq  
 bfh.bfOffBits=54; 0m51nw~B  
 CFile bf; a"#5JcR3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ UO>p-M  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %J2u+K  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !3?HpR/nV  
  bf.WriteHuge(lpData,size); YuLW]Q?v  
  bf.Close(); Eh8.S)E  
  nCount++; j YO #  
 } v3.JG]zLpP  
 GlobalFreePtr(lpData); eUx|_*`  
 if(nCount==1) Tx],- U  
  m_Number.Format("%d picture captured.",nCount); u=RF6V|  
 else =;^2#UxXA&  
  m_Number.Format("%d pictures captured.",nCount); ]7c715@  
  UpdateData(FALSE); e @=Bl-  
} } Tp!Ub\Cc  
q$>At} 4  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /d8PDc"  
{ }$81FSKh  
 if(pMsg -> message == WM_KEYDOWN) )P\ec  
 { GP`_R  
  if(pMsg -> wParam == VK_ESCAPE) q3 1swP  
   return TRUE; .* V ZY  
  if(pMsg -> wParam == VK_RETURN) 5 E DGl  
   return TRUE; *.W ![%Be  
 } sq&$   
 return CDialog::PreTranslateMessage(pMsg); 7lf* vqG  
} b~%(5r.  
 8(5}Jo+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]?b#~  
{ X;ijCZb3b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H-^>Co_  
  SaveBmp(); QTtcGU  
  return FALSE; b@z/6y!  
} hPD2/M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dhsQfWg#}  
 CMenu pop; }3=]1jH6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ),dXaP[  
 CMenu*pMenu=pop.GetSubMenu(0); R279=sO,J  
 pMenu->SetDefaultItem(ID_EXITICON); &*[T  
 CPoint pt;  h ej  
 GetCursorPos(&pt); 1r|'n aiZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); oT%~)g  
 if(id==ID_EXITICON) Pou`PNvH  
  DeleteIcon(); f{k2sU*uBE  
 else if(id==ID_EXIT) 6\/C]![%  
  OnCancel(); ZIkXy*<(  
 return FALSE; j`='SzVloW  
} $(.[b][S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZU7,=B=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /&cb`^"U^  
 AddIcon(); r Fdq \BSi  
 return res; wUW+S5"K  
} N1+%[Uh9)  
1+.(N:) +  
void CCaptureDlg::AddIcon() "qR qEpD%  
{ "4oY F:h  
 NOTIFYICONDATA data; 7p@qzE  
 data.cbSize=sizeof(NOTIFYICONDATA); >&Y8VLcK  
 CString tip; (lTM^3 }  
 tip.LoadString(IDS_ICONTIP); 7`|$uIM`  
 data.hIcon=GetIcon(0); s?7g3H5#0k  
 data.hWnd=GetSafeHwnd(); f9X*bEl9;`  
 strcpy(data.szTip,tip); yA \C3r'  
 data.uCallbackMessage=IDM_SHELL; a 0Hzf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; pRc@0^G  
 data.uID=98; _{C:aIl[2  
 Shell_NotifyIcon(NIM_ADD,&data); *:aJlvk  
 ShowWindow(SW_HIDE); aQ46euth  
 bTray=TRUE; Y(-4Agq  
} Y!Wz7 C  
Mw*R~OX  
void CCaptureDlg::DeleteIcon() /mo4Q?^  
{ (9{)4[3MAG  
 NOTIFYICONDATA data; 2u/~#Rt&*  
 data.cbSize=sizeof(NOTIFYICONDATA); uiPfAPZ  
 data.hWnd=GetSafeHwnd(); =| %:d:r  
 data.uID=98; Jf YO|,  
 Shell_NotifyIcon(NIM_DELETE,&data); ((B7k{`  
 ShowWindow(SW_SHOW); 3a"4Fn  
 SetForegroundWindow(); 7%&#V2  
 ShowWindow(SW_SHOWNORMAL); ZlUd^6|:3  
 bTray=FALSE; A"2k,{d  
} OB>Pk_eQK  
gj0gs  
void CCaptureDlg::OnChange() NYm2fFPc  
{ RxjC sjg  
 RegisterHotkey(); +F]X  
} /P Qz$e-!Y  
(kK6=Mrf  
BOOL CCaptureDlg::RegisterHotkey() ^8ZVB.Fv  
{ J-au{eP^  
 UpdateData(); "z1\I\ ^  
 UCHAR mask=0; GxuFO5wz  
 UCHAR key=0; sFT-aLpL@V  
 if(m_bControl) R%"wf   
  mask|=4; r**u=q %p  
 if(m_bAlt) 4S`2")V  
  mask|=2; Fi14_{  
 if(m_bShift) [x kbzJ  
  mask|=1; #9F=+[L  
  key=Key_Table[m_Key.GetCurSel()]; F%UyFUz  
 if(bRegistered){ N~=p+Ow[H  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ts<5%{M(  
  bRegistered=FALSE; CC;T[b&  
 } c0sU1:e0  
 cMask=mask; t$m268m~  
 cKey=key; W`*S?QGzl@  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )}0(7z Yu  
 return bRegistered; cz~Fz;)2{N  
} ] bz']`  
%V%*0S|U  
  四、小结 t,gKN^P_  
rn"'tvhm  
  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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