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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: <*0^X%Vf\  
  !]4'f/  
  一、实现方法 hv te)  
m/3b7c@r  
  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: B<(v\=xZ  
^Fgmwa'  
#pragma data_seg("shareddata") m5 r65=E  
HHOOK hHook =NULL; //钩子句柄 D Cx3_  
UINT nHookCount =0; //挂接的程序数目 =Y>_b 2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ['j_W$8n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 61>@-55k9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey oe,L&2Jz@  
static int KeyCount =0; Ej>5PXp'2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l'HrU 1_7Y  
#pragma data_seg() gJ cf~@s  
t a_!  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 jSp4eq  
2/O/h  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: o:jLM7$=  
B P%>J^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Ss+e*e5Ht  
cKey,UCHAR cMask) n; ;b6s5  
{ j_c0oclSz  
 BOOL bAdded=FALSE; ,  A?o  
 for(int index=0;index<MAX_KEY;index++){ wmdvAMN  
  if(hCallWnd[index]==0){ udM<jY]5p  
   hCallWnd[index]=hWnd; XZhuV<  
   HotKey[index]=cKey; iZ2|/hnw  
   HotKeyMask[index]=cMask; rr>*_67-:  
   bAdded=TRUE; ,2S w6u  
   KeyCount++; j+NOT`&  
   break; (( F[]<?  
  } 1?sR1du,  
 } hK*:pf  
 return bAdded; z8FeL5.(  
} yg\bCvL&  
//删除热键 KW|X\1H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )3PQ|r'  
{ xTNWT_d  
 BOOL bRemoved=FALSE; ?khwupdi  
 for(int index=0;index<MAX_KEY;index++){ 833KU_ N  
  if(hCallWnd[index]==hWnd){ pB;)H ii\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0@z=0}0Z  
    hCallWnd[index]=NULL; `G> 6  
    HotKey[index]=0; YqwDvJWX  
    HotKeyMask[index]=0;  *e{d^  
    bRemoved=TRUE; fl>*>)6pm  
    KeyCount--; R}7>*&S:  
    break; 3OTq  
   } ?XO$ 9J  
  } ~Q%C>  
 } >:%YAR`  
 return bRemoved; Wo&10S w  
} q@1!v  
tep_g4CQR_  
9^l_\:4  
  DLL中的钩子函数如下: ;hU56lfZ)X  
9v&{; %U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4L\bT;dQ|.  
{ $$`E@\5P  
 BOOL bProcessed=FALSE; i2`i5&*  
 if(HC_ACTION==nCode) "mr;|$Y  
 { i3g;B?54  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 TWE$@/9)g  
   switch(wParam) M6U/. n  
   {  os*QWSs  
    case VK_MENU: |9. `qv  
     MaskBits&=~ALTBIT; 0p\R@{  
     break; fXCx!3m  
    case VK_CONTROL: Zo  
     MaskBits&=~CTRLBIT; 6N[XWyS  
     break; d51l7't  
    case VK_SHIFT: 4SSq5Ve<  
     MaskBits&=~SHIFTBIT; (r,tU(  
     break; d4<Ic#  
    default: //judge the key and send message uV?[eiezD0  
     break; q5J6d+  
   } Qag@#!&n  
   for(int index=0;index<MAX_KEY;index++){ | W:JI  
    if(hCallWnd[index]==NULL) fdP[{.$?(  
     continue; +o})Cs`|=A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g(m3 &  
    { \NwL#bQ~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); mle"!*  
     bProcessed=TRUE; pJ[7m  
    } 2^N 4(  
   } d[;=X.fZ2  
  }  )TV4OT#  
  else if((lParam&0xc000ffff)==1){ //有键按下 ma.yI};$  
   switch(wParam) ;(M`Wy]2  
   { Z|+SC \Y  
    case VK_MENU: [P`t8  
     MaskBits|=ALTBIT; 3l"7$B  
     break; A8Q1x/d(  
    case VK_CONTROL: J2H/z5YRJ4  
     MaskBits|=CTRLBIT; )P>Cxzs  
     break; I4 dS,h  
    case VK_SHIFT: bJ8G5QU  
     MaskBits|=SHIFTBIT; O.4ty)*  
     break; (m|w&oA/  
    default: //judge the key and send message SA s wP  
     break; xh Sp<|X_  
   } vG9A'R'P  
   for(int index=0;index<MAX_KEY;index++){ ,W"Q)cL  
    if(hCallWnd[index]==NULL) uTY5.8  
     continue; >AIkkQT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]v96Q/a  
    { @4dB$QF`&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); odAeBQy  
     bProcessed=TRUE; QU0K'4Yx5j  
    } GGHe{l  
   } n)$T zND  
  } ) 9h5a+Z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ':6!f  
   for(int index=0;index<MAX_KEY;index++){ gHc0n0ZV  
    if(hCallWnd[index]==NULL) 5]n5nqz  
     continue; c%Ht; sK`*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JI-q4L|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); AK%2#}k.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 FaO1?.  
   } f6n'g:&.W  
  } IKSe X  
 } e -vL!&;2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H/m -$;cF3  
} CbTYt6DC  
6u^M fOc  
  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: rxtp?|v9  
M;*f(JY$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {2?o:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qv|geBW  
7N0V`&}T  
  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: .} <$2.  
J{c-'Of2yi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  boAu  
{ NFpR jC?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~*R"WiDtI  
 { b#cXn4<3D  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _hlLM,p  
  SaveBmp(); @#[<5ld  
  return FALSE; tpp. 9  
 } =9@{U2 =l  
 …… //其它处理及默认处理 !}fq%8"-  
} t>;u;XY!;  
>-fOkOWXy  
!_<zK:`-L  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 2:0'fNXop  
8/cD7O  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Y(QLlJ*)/  
Ia-`x/r*m  
  二、编程步骤 E'qGKT  
>g8H  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; D.?Rc'y D  
9C[i#+_3M  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; B;.]<k'3  
`0a=A#]1o  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; /Zs;dam  
1s5F jD?M  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; lJHV c"*/  
^b)8l  
  5、 添加代码,编译运行程序。 g/Q hI  
]#>;C:L  
三、程序代码 8$</HNu,  
Z%_"-ENT  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [>l 2E  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QT X5F5w  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w~EBm=v_>  
#if _MSC_VER > 1000 PScq-*^  
#pragma once t.'|[pOV  
#endif // _MSC_VER > 1000 |E:q!4?0  
#ifndef __AFXWIN_H__ #;ez MRKM"  
#error include 'stdafx.h' before including this file for PCH =@w,D.5h  
#endif Cz@[l=-T7  
#include "resource.h" // main symbols 4E[ 9)n+YV  
class CHookApp : public CWinApp P9(]9np,,  
{ L|hsGm\  
 public: c\.Hs9T >  
  CHookApp(); T;/Y/Fd  
  // Overrides ?`R;ZT)U-  
  // ClassWizard generated virtual function overrides LJ7Qwh_",  
  //{{AFX_VIRTUAL(CHookApp) 3 D<s #  
 public: dd4g?):  
  virtual BOOL InitInstance(); 3Z.<=D  
  virtual int ExitInstance(); &K Ti[  
  //}}AFX_VIRTUAL *h59Vaoc  
  //{{AFX_MSG(CHookApp) et[n;nl>V  
  // NOTE - the ClassWizard will add and remove member functions here. 6`(x)Q9  
  // DO NOT EDIT what you see in these blocks of generated code ! x>MrB  
  //}}AFX_MSG 4t3Y/X  
  DECLARE_MESSAGE_MAP() bs{i@1$  
}; !ER,o_T<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $kPC"!X\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @&!`.Y oy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :H/CiN  
BOOL InitHotkey(); daamP$h9  
BOOL UnInit(); #gjhs"$~  
#endif EXt?xiha?  
sp%EA=: E  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jv*[@ -.k  
#include "stdafx.h" rGjP|v@3^  
#include "hook.h" iDp'M`(6h  
#include <windowsx.h> uLok0"}  
#ifdef _DEBUG xb`,9.a7  
#define new DEBUG_NEW ktQMkEj#  
#undef THIS_FILE YK(I '  
static char THIS_FILE[] = __FILE__; ]P lD e8  
#endif ,khB*h14;h  
#define MAX_KEY 100 t+C9QXY  
#define CTRLBIT 0x04 72J@Dc  
#define ALTBIT 0x02 Y`$dtg {  
#define SHIFTBIT 0x01 3/+r*lv>X  
#pragma data_seg("shareddata") qfF/X"#0  
HHOOK hHook =NULL; ')]K&  
UINT nHookCount =0; NCm>iEeY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey xw2dEvjgp%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT jhs('n,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey XN+~g.0  
static int KeyCount =0; "VEA71  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d4'*K1m   
#pragma data_seg() Gwl]sMJ  
HINSTANCE hins; /F#_~9JXG  
void VerifyWindow(); ""LCyKu   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) u~kfz*hz  
//{{AFX_MSG_MAP(CHookApp) (sX=#<B%  
// NOTE - the ClassWizard will add and remove mapping macros here. & w%%{lM  
// DO NOT EDIT what you see in these blocks of generated code! RY8Ot2DWi  
//}}AFX_MSG_MAP 46U?aHKW@|  
END_MESSAGE_MAP() "M e)'  
k 4|*t}o7  
CHookApp::CHookApp() G's >0  
{ SRL`!  
 // TODO: add construction code here, sfLH[Q?  
 // Place all significant initialization in InitInstance 3awh>1N2 W  
} ;%u'w;sgq  
+C`h*%BW  
CHookApp theApp; P3[!-sv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "'389*-  
{ y^utMH  
 BOOL bProcessed=FALSE; XQI. z7F  
 if(HC_ACTION==nCode) lHg&|S&J  
 { H)#HK!F6f  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1Q$ePo   
   switch(wParam) iR k.t=B  
   { w.tQ)x1h  
    case VK_MENU: _FV<[x,nE8  
     MaskBits&=~ALTBIT; \2$-.npz  
     break; 3_%lN4sz  
    case VK_CONTROL: :wlX`YW+e  
     MaskBits&=~CTRLBIT; ZHA6BVVT  
     break; <Q-Y$ ^\  
    case VK_SHIFT: M]\p9p(_  
     MaskBits&=~SHIFTBIT; sY @S  
     break; (``EBEn  
    default: //judge the key and send message -K+" :kiS  
     break; m(~5X0  
   } +kh#Jq.  
   for(int index=0;index<MAX_KEY;index++){ < 0S+[7S"  
    if(hCallWnd[index]==NULL) l)JNNcej  
     continue; gY)NPi}!`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MjGeH>c  
    { e|ChCvk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); - v\n0Jt  
     bProcessed=TRUE; {Ac5(li_  
    } f7y a0%N  
   } i5oV,fiZo  
  } Oa[G #  
  else if((lParam&0xc000ffff)==1){ //Key down tS$^k)ZXip  
   switch(wParam) yrp;G_  
   { ]{tnNr>mv  
    case VK_MENU: FlWgTn>  
     MaskBits|=ALTBIT; y.KFz9Qv  
     break; v0~'`*|&  
    case VK_CONTROL: | rY.IbL  
     MaskBits|=CTRLBIT; \ C^fi}/]  
     break; )3W`>7>  
    case VK_SHIFT: ]p,sve vo  
     MaskBits|=SHIFTBIT; y)`f$Hl@1  
     break; fpCkT[&m  
    default: //judge the key and send message *'b3Z3c,;  
     break; jacp':T  
   } _?9|0>]xG  
   for(int index=0;index<MAX_KEY;index++) QKj8~l(  
   { ~Ibq,9i  
    if(hCallWnd[index]==NULL) ~Y- !PZ  
     continue; 3~Qvp )~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qs96($  
    { `WjRb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ck=x_HB1  
     bProcessed=TRUE; =dVPx<l5  
    } ^A4bsoW  
   } L4fM?{Ic:s  
  } v[3QI7E3  
  if(!bProcessed){ `s0`kp  
   for(int index=0;index<MAX_KEY;index++){ {8'f>YP  
    if(hCallWnd[index]==NULL) 3LxhQVx2  
     continue; 9VEx0mkdd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o09)esy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {FIr|R&  
   } *]L(,_:"  
  }  73:y&U  
 } :h4Nfz(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [8-. T4  
} aFCma2  
v-(Ry<fT9  
BOOL InitHotkey() R2]2#3`  
{ &, =Z  
 if(hHook!=NULL){ /< OoZf+[  
  nHookCount++; bO)voJ<  
  return TRUE; XXx]~m  
 } M_<? <>|  
 else ,KT[ }P7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %OI4}!z@l  
  if(hHook!=NULL) my.%zF  
   nHookCount++; 4,nUCT  
  return (hHook!=NULL); 2J>v4EWC  
} z5V~m_RO  
BOOL UnInit() EAPLe{qw:q  
{ ;x]CaG)f  
 if(nHookCount>1){ 'Gr}<B$A3  
  nHookCount--; 6~:eO(pK l  
  return TRUE; Ng1{ NI+S  
 } 5,i0QT"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); IB'gY0*  
 if(unhooked==TRUE){ !CnkG<5z>  
  nHookCount=0; '@jP$6T&  
  hHook=NULL; c.<bz  
 } v;%>F)I  
 return unhooked; ^lI>&I&1  
} 5{`a\;*  
5a0&LNm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *$+:Cbe-F  
{ z2/E?$(  
 BOOL bAdded=FALSE; Eku+&f@RB  
 for(int index=0;index<MAX_KEY;index++){ q_J)68BR  
  if(hCallWnd[index]==0){ 1@$n )r`  
   hCallWnd[index]=hWnd; x{o&nhuk[S  
   HotKey[index]=cKey; Cyn_UE  
   HotKeyMask[index]=cMask; u0s25JY.%  
   bAdded=TRUE; "DpgX8lG_  
   KeyCount++; ees^j4  
   break; ZQ MK1  
  } eeOE\  
 } F\)?Ntj)>@  
 return bAdded; eeix-Wt*E  
} }$5e!t_K  
OG!+p}yD]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !_a@autj  
{  x%$as;  
 BOOL bRemoved=FALSE; UA%tI2  
 for(int index=0;index<MAX_KEY;index++){ Klv~#9Si  
  if(hCallWnd[index]==hWnd){ GIs *;ps7w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1( nK|  
    hCallWnd[index]=NULL;  f^vz  
    HotKey[index]=0; S.E'fc1  
    HotKeyMask[index]=0;  1OwVb  
    bRemoved=TRUE; It@1!_tO2  
    KeyCount--; 01br l^5K  
    break; ?h1r6?Sug{  
   } MODi:jsl  
  } @D3|Ak1  
 } k~|5TO  
 return bRemoved; c]OK)i-{l  
} SI~MTUqt  
U6sPJc<  
void VerifyWindow() m7n8{J1O2  
{ V=+wsc  
 for(int i=0;i<MAX_KEY;i++){ Y!0ZwwW  
  if(hCallWnd!=NULL){ w~lxWgaY7  
   if(!IsWindow(hCallWnd)){ M{   
    hCallWnd=NULL; wq6.:8Or-]  
    HotKey=0; Q=}U  
    HotKeyMask=0; Dau'VtzN  
    KeyCount--; \-F F[:|J  
   } m0$~O5|4  
  } Zf [#~4  
 } G*].g['  
} 6.0/asN}  
cCWk^lF],  
BOOL CHookApp::InitInstance() hp< NVST  
{ aplOo[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "6} #65  
 hins=AfxGetInstanceHandle(); Rv^ \o  
 InitHotkey(); ~a RK=i$F  
 return CWinApp::InitInstance(); @x4IxGlUs  
} LNU#NJ^Axt  
YH .+(tNv  
int CHookApp::ExitInstance() OqW (C  
{ 9yA? 82)E  
 VerifyWindow(); "^3pP(8;~  
 UnInit(); ]u(EEsG/  
 return CWinApp::ExitInstance(); _=s{,t &u  
} F/(z3Kf  
hZ;[}5T\<S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]>%M%B  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `N,q~@gL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I"Gr<?r  
#if _MSC_VER > 1000 d_r1 }+ao  
#pragma once v_s(  
#endif // _MSC_VER > 1000 <T0+-]i  
~Y3"vdd  
class CCaptureDlg : public CDialog ]!=,8dY  
{ {:!CA/0Jx  
 // Construction r:QLO~l/  
 public: P!*G"^0<  
  BOOL bTray; )vcyoq  
  BOOL bRegistered; x+V@f~2F  
  BOOL RegisterHotkey(); ^vQ,t*Uj=  
  UCHAR cKey; 1p%75VW  
  UCHAR cMask; O,+ZD^  
  void DeleteIcon(); VBe.&b8  
  void AddIcon(); = "N?v-  
  UINT nCount; w]ZE('3%W  
  void SaveBmp(); sBuOKT/j  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2xEG s Q  
  // Dialog Data E2Jmo5yJR  
  //{{AFX_DATA(CCaptureDlg) K:3u/C`  
  enum { IDD = IDD_CAPTURE_DIALOG }; BA 9c-Ay  
  CComboBox m_Key; ztRe\(9bL  
  BOOL m_bControl;  `[=3_  
  BOOL m_bAlt; },W<1*|  
  BOOL m_bShift; &P,z$H{o@  
  CString m_Path; ^zs]cFN#%  
  CString m_Number; m[t4XK  
  //}}AFX_DATA dQkp &.  
  // ClassWizard generated virtual function overrides lz-t+LD@ST  
  //{{AFX_VIRTUAL(CCaptureDlg) -{tB&V~+v  
 public: h jCkj(b  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j0F'I*Z3  
 protected: #F~^m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zx7g5;J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !9/1_Bjv  
  //}}AFX_VIRTUAL zK P{A Sk  
  // Implementation -3)]IA  
 protected: q#n0!5Lv2  
  HICON m_hIcon; '. '}  
  // Generated message map functions JO^E x1c  
  //{{AFX_MSG(CCaptureDlg) cp&- 6 w+  
  virtual BOOL OnInitDialog(); E Pgn2[z  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wj$J} F  
  afx_msg void OnPaint(); 6*({ZE  
  afx_msg HCURSOR OnQueryDragIcon(); j18qY4Gw)  
  virtual void OnCancel(); }0 BKKU+  
  afx_msg void OnAbout(); \>%.ktG  
  afx_msg void OnBrowse(); 1l(_SD;90t  
  afx_msg void OnChange(); ~$PQ8[=  
 //}}AFX_MSG e7cqm*Qi  
 DECLARE_MESSAGE_MAP() '0juZ~>}  
}; |1@/gqa  
#endif GF3"$?Cw  
Cqy)+x_OQ,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file h ?Ni5  
#include "stdafx.h" A{3?G -]*  
#include "Capture.h" QS*!3? %  
#include "CaptureDlg.h" -ST[!W V  
#include <windowsx.h> 64hl0'67y  
#pragma comment(lib,"hook.lib") &QoV(%:]  
#ifdef _DEBUG YjT7_|`(]  
#define new DEBUG_NEW t5qNfiKC  
#undef THIS_FILE \+STl#3*q  
static char THIS_FILE[] = __FILE__; \"X<\3z2  
#endif %O! ~!'  
#define IDM_SHELL WM_USER+1 :JEzfI1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'rX!E,59  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &f:"p*=a\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xjplJ'jB  
class CAboutDlg : public CDialog (eOzntp8  
{ +] .Zs<  
 public: <yxEGjm  
  CAboutDlg(); l.V{H<v}  
  // Dialog Data $eI=5   
  //{{AFX_DATA(CAboutDlg) ?/SIA9VK  
  enum { IDD = IDD_ABOUTBOX }; \}:&Hl+  
  //}}AFX_DATA %B ,>6 `[  
  // ClassWizard generated virtual function overrides _aR_ [  
  //{{AFX_VIRTUAL(CAboutDlg) ["N)=d|LS  
 protected: L ~,x~sLd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *gJ:irah  
  //}}AFX_VIRTUAL |fJpX5W-l  
  // Implementation aMxg6\8  
 protected: ?dJ[? <aG  
  //{{AFX_MSG(CAboutDlg) 'mH9 O  
  //}}AFX_MSG TT'sO[N[  
  DECLARE_MESSAGE_MAP() -UHa;W H  
}; (.:!_OB0N  
h=fzX .dt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) r&u&$ "c  
{ %9}5~VM"q  
 //{{AFX_DATA_INIT(CAboutDlg) #LGAvFA*_F  
 //}}AFX_DATA_INIT y rSTU-5u  
} \fHtk _  
V*uoGWL]+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *~t&Ux#hj  
{ "M)kV5v%  
 CDialog::DoDataExchange(pDX); Y [hTO.LF  
 //{{AFX_DATA_MAP(CAboutDlg) ifA)Ppt<`  
 //}}AFX_DATA_MAP K>"]*#aBv  
} Z'vic#  
Fp_?1 y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q&j4PR{  
 //{{AFX_MSG_MAP(CAboutDlg) yXuF<+CJ  
 // No message handlers ~HW}Wik  
 //}}AFX_MSG_MAP $50/wb6s  
END_MESSAGE_MAP() q0Hor   
z qM:'x*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) tp6-j`7u  
: CDialog(CCaptureDlg::IDD, pParent) s/;iZiWK  
{ X ^ ?M4  
 //{{AFX_DATA_INIT(CCaptureDlg) c v .R`)l  
  m_bControl = FALSE; {0&'XA=j  
  m_bAlt = FALSE; -HE@wda  
  m_bShift = FALSE; W^es"\  
  m_Path = _T("c:\\"); gPo3jwo$  
  m_Number = _T("0 picture captured."); j}uVT2ZE%  
  nCount=0; E{Tvjh+  
  bRegistered=FALSE; F8c^M</  
  bTray=FALSE;  Uz;z  
 //}}AFX_DATA_INIT -<Wv7FNpD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8lI'[Y?3.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &jg..R  
} mbij& 0  
U{8]TEv  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ,#NH]T`c1  
{ ~ AU!Gm.  
 CDialog::DoDataExchange(pDX); sX8?U,u  
 //{{AFX_DATA_MAP(CCaptureDlg) 4iDlBs+  
  DDX_Control(pDX, IDC_KEY, m_Key); 5Tl3k=o}  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); gcaXN6C  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (jV_L 1D  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Yv!r>\#0S  
  DDX_Text(pDX, IDC_PATH, m_Path); Id<3'ky<N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L.%N   
 //}}AFX_DATA_MAP w9Eb\An  
} -0 e&>H%  
7sC8|+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D^G5$h i  
//{{AFX_MSG_MAP(CCaptureDlg) )[w_LHKI  
 ON_WM_SYSCOMMAND() ~h:/9q  
 ON_WM_PAINT() B%.XWW$  
 ON_WM_QUERYDRAGICON() J Uf{;nt  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) XOdkfmc+s'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lT<4c5 %  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^:(:P9h  
//}}AFX_MSG_MAP ZRK1 UpP  
END_MESSAGE_MAP() -F]0Py8(  
_#kjiJj *  
BOOL CCaptureDlg::OnInitDialog() YFGQPg  
{ ~ sC<V  
 CDialog::OnInitDialog(); .y)Y20=o!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); NV[_XXTv7  
 ASSERT(IDM_ABOUTBOX < 0xF000); >h[ {_+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uTX0lu;  
 if (pSysMenu != NULL) bnm3 cR:h"  
 { FtEmSKD  
  CString strAboutMenu; 1]yjhw9g  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6G6B!x  
  if (!strAboutMenu.IsEmpty()) GWQ_X9+q  
  { No'^]r  
   pSysMenu->AppendMenu(MF_SEPARATOR); `H^?jX>7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y!+q3`-%T  
  } Xv5|j/<~p  
 } 0Xke26ga  
 SetIcon(m_hIcon, TRUE); // Set big icon R3[H#*gF<  
 SetIcon(m_hIcon, FALSE); // Set small icon K<3$>/|  
 m_Key.SetCurSel(0); %.zcE@7*  
 RegisterHotkey(); a9w1Z4  
 CMenu* pMenu=GetSystemMenu(FALSE); ](z?zDk  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oD0N<Ln}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X-Q;4M-CJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); LHS^[}x^1  
 return TRUE; // return TRUE unless you set the focus to a control knPo"GQW  
} Hy_}e"  
fG^#G/n2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uqN:I)>[P  
{ }+" N '  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9T#JlV  
 { qXb{A*J  
  CAboutDlg dlgAbout; Y XBU9T{r  
  dlgAbout.DoModal(); ;`TSu5/  
 } tR;? o,T  
 else VgoN=S  
 { =,UuQJ,l  
  CDialog::OnSysCommand(nID, lParam); R>3a?.X  
 } ,%L>TD'48s  
} neHozmm|  
/{j")  
void CCaptureDlg::OnPaint() .\W6XRw  
{  <0,szw  
 if (IsIconic()) #]BpTpRAe<  
 { H/eyc`  
  CPaintDC dc(this); // device context for painting 8" x+^  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +&T;jad2  
  // Center icon in client rectangle mJ>@Dh3>G  
  int cxIcon = GetSystemMetrics(SM_CXICON); TC2gl[  
  int cyIcon = GetSystemMetrics(SM_CYICON); oQkY@)3.w  
  CRect rect; \w]c<gM K  
  GetClientRect(&rect); vE9M2[TJA  
  int x = (rect.Width() - cxIcon + 1) / 2; \mBH6GS  
  int y = (rect.Height() - cyIcon + 1) / 2; LPOZA`  
  // Draw the icon c1,dT2:=  
  dc.DrawIcon(x, y, m_hIcon); {O"?_6',  
 } Rilr)$  
 else [~ Wiy3n  
 { )ZU=`!4  
  CDialog::OnPaint(); .Fz5K&E=  
 } OZw<YR  
} bwo{ Lw~  
Cw=wU/)  
HCURSOR CCaptureDlg::OnQueryDragIcon() K-xmLEu  
{ w(P\+ m<%  
 return (HCURSOR) m_hIcon; S[J=d%(  
} V!'N:je  
xTnd9'Pk`:  
void CCaptureDlg::OnCancel() cI5*`LML1  
{ ~okIiC]#  
 if(bTray) Se o3a6o  
  DeleteIcon(); . k6)  
  CDialog::OnCancel(); tGKIJ`w*h  
} zEQ<Q\"1  
DIk\=[{2q  
void CCaptureDlg::OnAbout() R|Oy/RGY$  
{ LNp%]*h  
 CAboutDlg dlg; OFJ T  
 dlg.DoModal(); }T?MWcG4  
} /S]W< 8d  
&h7q=-XU   
void CCaptureDlg::OnBrowse() ;w(]z  
{ Oc;/'d2  
 CString str; q2I;Ly\3o  
 BROWSEINFO bi; ." m6zq  
 char name[MAX_PATH]; 67I6]3[ Z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); XUD/\MoV  
 bi.hwndOwner=GetSafeHwnd(); )e)@_0  
 bi.pszDisplayName=name; {__Z\D2I  
 bi.lpszTitle="Select folder"; CI+dIv>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \WM*2&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jafq(t  
 if(idl==NULL) ~Od4( }/G  
  return; (K$K;f$"r  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nL}bCX{  
 str.ReleaseBuffer(); UarU.~Uqi  
 m_Path=str; b$sw`Rsw  
 if(str.GetAt(str.GetLength()-1)!='\\') eSynw$F2N  
  m_Path+="\\"; &jgpeFiiC  
 UpdateData(FALSE); 8wz4KG3SK  
} %Fc, $ =  
\lKiUy/  
void CCaptureDlg::SaveBmp() ;Ef:mr"Nu  
{ <zN  
 CDC dc; L~1u?-zu  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \s2hep  
 CBitmap bm; pti`q )  
 int Width=GetSystemMetrics(SM_CXSCREEN); QD LXfl/  
 int Height=GetSystemMetrics(SM_CYSCREEN); ce{GpmW  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %S8e:kc6  
 CDC tdc; B$k<F8!%  
 tdc.CreateCompatibleDC(&dc); M}4%LjD  
 CBitmap*pOld=tdc.SelectObject(&bm); n4%|F'ma  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a z 7Vy-  
 tdc.SelectObject(pOld); ;T2)nSAqt  
 BITMAP btm; T0WB  
 bm.GetBitmap(&btm); m",wjoZe*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *b?C%a9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Q>nq~#3?  
 BITMAPINFOHEADER bih; ~V?O%1)k?\  
 bih.biBitCount=btm.bmBitsPixel; v*5n$UFV  
 bih.biClrImportant=0; ^RG6h  
 bih.biClrUsed=0; %R5APMg1  
 bih.biCompression=0; "GP!]3t  
 bih.biHeight=btm.bmHeight; SsDz>PP  
 bih.biPlanes=1; R2Fh WiL  
 bih.biSize=sizeof(BITMAPINFOHEADER); $]4^ENkI  
 bih.biSizeImage=size; ll {jE  
 bih.biWidth=btm.bmWidth; e#K =SV!H  
 bih.biXPelsPerMeter=0; H,qIHQW#  
 bih.biYPelsPerMeter=0; hG cq>Cvf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #d%'BUde  
 static int filecount=0; fGJPZe  
 CString name; 9|dgmEd  
 name.Format("pict%04d.bmp",filecount++); PYqx&om  
 name=m_Path+name; 4VPL -":6  
 BITMAPFILEHEADER bfh; @`aR*B  
 bfh.bfReserved1=bfh.bfReserved2=0; cu|gM[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $rDeI-)S  
 bfh.bfSize=54+size; @D8c-`LC"*  
 bfh.bfOffBits=54; :(?joLA  
 CFile bf; zF%CFqQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ x^}kG[s  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i]*W t8~!  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  (7x5  
  bf.WriteHuge(lpData,size); 6%NX|4_  
  bf.Close(); >`p`^:  
  nCount++; )JE;#m0q  
 } aksyr$d0V<  
 GlobalFreePtr(lpData); 3 q  
 if(nCount==1) ys:1%D,,_  
  m_Number.Format("%d picture captured.",nCount); e0"R7a  
 else Mjq1qEi"B  
  m_Number.Format("%d pictures captured.",nCount); >/1N#S#9  
  UpdateData(FALSE); r_T\%  
} =?T\zLN=  
H r?G_L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +vaz gO<u  
{ CQ2{5  
 if(pMsg -> message == WM_KEYDOWN) 5+b[-Daz  
 { #gi0FXL  
  if(pMsg -> wParam == VK_ESCAPE) 3N(s)N_P M  
   return TRUE; r#*kx#"  
  if(pMsg -> wParam == VK_RETURN) 33|>u+  
   return TRUE; qyv9]Q1  
 } v0|A N  
 return CDialog::PreTranslateMessage(pMsg); z`((l#(  
} NY\q  
jNB|98NN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lz@fXaZM  
{ ;rJR+wpNa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6#fl1GdH-  
  SaveBmp(); :j9{n ,F  
  return FALSE; g}0}$WgH:  
} x;S v&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]p:x,%nm  
 CMenu pop; F"VNz^6laV  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [jve |-v=  
 CMenu*pMenu=pop.GetSubMenu(0); Zalgg/.  
 pMenu->SetDefaultItem(ID_EXITICON); /8@JWK^I{  
 CPoint pt; k'}}eu/ q  
 GetCursorPos(&pt); CFAz/x@%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &Eg>[gAIlp  
 if(id==ID_EXITICON) 7(^<Z5@  
  DeleteIcon(); lBh|+K N  
 else if(id==ID_EXIT) lZZ4 O(  
  OnCancel(); P!:Y<p{=>  
 return FALSE; o0&jel1a  
} 5:E7nqsNhq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @FIR9XJ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |1X^@  
 AddIcon(); pL8+gL  
 return res; u& ?J+  
} bVSa}&*kM  
b+yoD  
void CCaptureDlg::AddIcon() n^'ip{  
{ Q7UFF  
 NOTIFYICONDATA data; ]H0BUg  
 data.cbSize=sizeof(NOTIFYICONDATA); YFOSv]w  
 CString tip; {EGiGwpf  
 tip.LoadString(IDS_ICONTIP); K/79Tb-  
 data.hIcon=GetIcon(0); nzE4P3 C+  
 data.hWnd=GetSafeHwnd(); GJai!$v  
 strcpy(data.szTip,tip); KL,=Z&.<=  
 data.uCallbackMessage=IDM_SHELL; qY`)W[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; o1YX^-<[F  
 data.uID=98; &}@U#w]l  
 Shell_NotifyIcon(NIM_ADD,&data); ))cL+ r  
 ShowWindow(SW_HIDE); Gp'rN}i^  
 bTray=TRUE; LOpn PH`  
} YpoO:  
q]YPDdR#  
void CCaptureDlg::DeleteIcon() zvYkWaa_Qz  
{ 5s_7 P"&H  
 NOTIFYICONDATA data; =z'- B~  
 data.cbSize=sizeof(NOTIFYICONDATA); jhrmQS  
 data.hWnd=GetSafeHwnd(); 7S LJLn3d  
 data.uID=98; =($RT  
 Shell_NotifyIcon(NIM_DELETE,&data); ~4y&]:I  
 ShowWindow(SW_SHOW); F&.iY0Pt  
 SetForegroundWindow(); s$css{(ek  
 ShowWindow(SW_SHOWNORMAL); ,@jRe&6  
 bTray=FALSE; :TJv<NZi'  
} <8yzBp4gZ  
H_m(7@=  
void CCaptureDlg::OnChange() ]c]rIOTN  
{ asb-syqU  
 RegisterHotkey(); -;&aU;k  
} $D +6=m[  
34k<7X`I  
BOOL CCaptureDlg::RegisterHotkey() 8M*[RlUJB  
{ eyf\j,xP&  
 UpdateData(); iM+K&\{_h  
 UCHAR mask=0; fu'iG7U M  
 UCHAR key=0; %l%5Q;t  
 if(m_bControl) -hj@^Auf  
  mask|=4; #Mw|h^ Wm  
 if(m_bAlt) \c3zK|^  
  mask|=2; ^ }Rqe  
 if(m_bShift) A|1 TE$  
  mask|=1; GY,l&.&  
  key=Key_Table[m_Key.GetCurSel()]; 2%U)y;$m2  
 if(bRegistered){ $7eO33Bm  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *CZvi0&  
  bRegistered=FALSE; WL$Ee=  
 } ] C_g: |q  
 cMask=mask; 7yo/ sb9h  
 cKey=key; /=I&-g xC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (G $nN*rlu  
 return bRegistered; #Ki(9oWd  
} yG|^-O}L  
s `fIeP  
  四、小结 P3V=DOG"  
|6w.m<p  
  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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