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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: IQ!\w-  
  /1 RAAa  
  一、实现方法 ex<O]kPFE  
suH&jE$x  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: siTX_`0  
c,Euv>*`  
#pragma data_seg("shareddata") vm'5s]kdh  
HHOOK hHook =NULL; //钩子句柄 Sggq3l$Qc  
UINT nHookCount =0; //挂接的程序数目 0oh]61g C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i%{3W:!4t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 vfNAs>Xg"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey UYA_jpIP  
static int KeyCount =0; e;GU T:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2..,Sk  
#pragma data_seg() ~Xlrvb}LP  
x'zBK0i  
  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。 l_j4DQBRV  
O}[PJfvBHo  
  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: [I:KpAd/  
y}v+c%d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &vovA} F  
cKey,UCHAR cMask) [DHoGy,P  
{ p7ir*r/2  
 BOOL bAdded=FALSE; c>1RP5vx  
 for(int index=0;index<MAX_KEY;index++){ ZvGgmLN  
  if(hCallWnd[index]==0){ UA~RK2k?  
   hCallWnd[index]=hWnd; {"vkji>  
   HotKey[index]=cKey; W- $a Y2  
   HotKeyMask[index]=cMask; >|Q:g,I  
   bAdded=TRUE; NWfAxkz {/  
   KeyCount++; ?k[p<Uo  
   break; K\^ 0_F K  
  } 6r"u$i` o  
 } dx,=Rd5'  
 return bAdded; &ff&Y.q~  
} WhBpv(q}.  
//删除热键 ^2o dr \  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H +bdsk  
{ Og%U  
 BOOL bRemoved=FALSE; fn CItK~y  
 for(int index=0;index<MAX_KEY;index++){ <e%F^#y_  
  if(hCallWnd[index]==hWnd){ J!ntXF  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |KYEK|  
    hCallWnd[index]=NULL; "&Qctk`<P  
    HotKey[index]=0; ?8, %LIQ?  
    HotKeyMask[index]=0; rC_*sx r^  
    bRemoved=TRUE; <P%}|@  
    KeyCount--; '<iK*[NW  
    break; q EUT90  
   } ._z 'g_c(  
  } QMo}W{D  
 }  qW_u  
 return bRemoved; X~ Rl 6/,  
} S>q>K"j^!  
3ew8m}A{O  
fU2qrcVu  
  DLL中的钩子函数如下: 2}vg U$a  
WqrgRpM{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MYe HS   
{ 2eQdQwX  
 BOOL bProcessed=FALSE; JM.XH7k  
 if(HC_ACTION==nCode) 'rb'7=z5  
 { RE3Z%;'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2h {q h  
   switch(wParam) BsZ{|,oQnZ  
   {  ;oH ,~|K  
    case VK_MENU: 7?"y{R>E  
     MaskBits&=~ALTBIT; 3}1ssU"T  
     break; l]2r)!Q7  
    case VK_CONTROL: 4y}"Hy  
     MaskBits&=~CTRLBIT; (/ " &  
     break; ?v}Bd!'+P  
    case VK_SHIFT: *oI*-C  
     MaskBits&=~SHIFTBIT; bVr*h2 p  
     break; mT*{-n_Zs  
    default: //judge the key and send message 1U\$iy8}  
     break; G&eP5'B4i  
   } qu6DQ@ ~YC  
   for(int index=0;index<MAX_KEY;index++){ SKY*.IW/Z  
    if(hCallWnd[index]==NULL) 9=dkx^q  
     continue; FZpKFsPx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9O,,m~B  
    { Lb=W;9;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %bb~Y"  
     bProcessed=TRUE; ~:sE:9$z  
    } o[6y+<'o  
   } oCi ~P}r  
  } CPazEe1S  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,je`YEC  
   switch(wParam) P}3}ek1Ax  
   { GgFi9Ffj  
    case VK_MENU: 1D([@)^  
     MaskBits|=ALTBIT; ~H@+D}J?  
     break; ekf$dgoR  
    case VK_CONTROL: }ublR&zlp  
     MaskBits|=CTRLBIT; Y^ve:Z  
     break; K% KZO`gO  
    case VK_SHIFT: H ;@!?I  
     MaskBits|=SHIFTBIT; y@ek=fT%4  
     break; m)?5}ZwAH  
    default: //judge the key and send message 1ywU@].6J]  
     break; J_#R 87  
   } 0_<Nc/(P  
   for(int index=0;index<MAX_KEY;index++){ @u4=e4eF`  
    if(hCallWnd[index]==NULL) s0LA^2U  
     continue; ^gro=Bp(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  h=RD O  
    { YwT-T,oD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5a8>g [2U  
     bProcessed=TRUE; \Xg?Ug*9w  
    } y)J(K*x/$  
   } wod/&!)]A  
  } =F%RLpNU4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^Ip3A  
   for(int index=0;index<MAX_KEY;index++){ 3=4SGt5m  
    if(hCallWnd[index]==NULL) 1|y$~R.H  
     continue; Nofu7xiDw[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?H;{~n?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cHvF*A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !)OB@F%U  
   } /nB'kg[h\  
  } ?p8Qx\%*  
 } m24v@?*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &,W$-[  
} (7q^FtjA#  
,I*X) (  
  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: 7|D|4!i2Y  
L-'k7?%(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qJs[i>P[W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p%RUHN3G[  
, r+"7$  
  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: Etnb3<^[t  
?g  }kb  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c]m! G'L_/  
{ F$6? t.@J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 2)LX^?7R  
 { /(6zsq'v|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }ymvC  
  SaveBmp(); Z$2L~j"=!  
  return FALSE; ]if;A)'  
 } {/UhUG  
 …… //其它处理及默认处理 (.^8^uc 7X  
} [ #]jC[  
z%2w(&1  
wL eHQ]  
  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。 !]DuZ=  
)bW<8f2  
  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。 el@XK}<dr  
kO3 `54  
  二、编程步骤 H @!#;w  
Gp1EJ2d8  
  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"; m6so]xr  
)A83A<~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ph^4GBR   
IRB& j%LA  
  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; %-^}45](q  
9/;{>RL=  
  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; !kh{9I>M  
$N\+,?  
  5、 添加代码,编译运行程序。 q+/l"&j.  
BjD&> gO)  
三、程序代码 EzP#Mnz^  
m "]!I~jd  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL AVpuMNd@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ow3a0cF[9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5#u.pu  
#if _MSC_VER > 1000 3X'WR]  
#pragma once eY3=|RR  
#endif // _MSC_VER > 1000 i_Ar<9a~  
#ifndef __AFXWIN_H__ ?M"HXu  
#error include 'stdafx.h' before including this file for PCH IQ{?_'  
#endif 9t }xXk  
#include "resource.h" // main symbols 8eww7k^R  
class CHookApp : public CWinApp t,Q'S`eTU  
{ Y +qus  
 public: qc-C>Ra  
  CHookApp(); 6UB6;-  
  // Overrides z6Z='=pT  
  // ClassWizard generated virtual function overrides #<}kISV0  
  //{{AFX_VIRTUAL(CHookApp) Y(z }[`2  
 public: 33M}>$ZH  
  virtual BOOL InitInstance(); q%.bnF/Yd  
  virtual int ExitInstance(); 4<yK7x  
  //}}AFX_VIRTUAL '^1o/C  
  //{{AFX_MSG(CHookApp) %gTVW!q  
  // NOTE - the ClassWizard will add and remove member functions here. $[Q cEk  
  // DO NOT EDIT what you see in these blocks of generated code ! sX~45u \  
  //}}AFX_MSG 51/sTx<Z}  
  DECLARE_MESSAGE_MAP() Vj7Hgc-,  
}; nt`<y0ta  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |8;? *s`H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i@{*O@m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lVT&+r~r  
BOOL InitHotkey(); [D9:A  
BOOL UnInit(); "i''Ui\H  
#endif 2lJZw@  
{kG;."S+K  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. GiqBzV3"  
#include "stdafx.h" &G=0  
#include "hook.h" =BW9/fG  
#include <windowsx.h> GWh|FEqUbf  
#ifdef _DEBUG 9TW8o}k`  
#define new DEBUG_NEW a^/K?lAB8  
#undef THIS_FILE $P_x v  
static char THIS_FILE[] = __FILE__; ~bFdJj 1*  
#endif =VCQ*  
#define MAX_KEY 100 p\ok_*b  
#define CTRLBIT 0x04 eEie?#Z/6  
#define ALTBIT 0x02 %xh?!s|G(  
#define SHIFTBIT 0x01 uf?b%:A  
#pragma data_seg("shareddata") Wa}"SqYr h  
HHOOK hHook =NULL; j #es2;  
UINT nHookCount =0; H\f/n`@,G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,N;v~D$Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT h;}ODK(.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }(cY|  
static int KeyCount =0; .hgH9$\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U[Nosh)hu\  
#pragma data_seg() "<T ~jk"u  
HINSTANCE hins; mCG;[4gM  
void VerifyWindow(); tKX}Ok:V%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )?9\$^I  
//{{AFX_MSG_MAP(CHookApp) U>1b9G"_  
// NOTE - the ClassWizard will add and remove mapping macros here. mR!rn^<l  
// DO NOT EDIT what you see in these blocks of generated code! :OX$LCi  
//}}AFX_MSG_MAP >OTl2F}4 !  
END_MESSAGE_MAP() -Fa98nV.WB  
-UTV:^  
CHookApp::CHookApp()  "YD.=s  
{ 6,3}/hgWJ$  
 // TODO: add construction code here, x36NL^  
 // Place all significant initialization in InitInstance fYs?D+U;PF  
} p&m ^IWD  
_Z0\`kba+  
CHookApp theApp; `+Xe'ey  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) c-|kv[\a  
{ DUQ9AT#3  
 BOOL bProcessed=FALSE; *H?t;,\  
 if(HC_ACTION==nCode) `TkbF9N+  
 { h\2}875  
  if((lParam&0xc0000000)==0xc0000000){// Key up p^Agh  
   switch(wParam) -2z,cj&E{  
   { "C& Jwm?  
    case VK_MENU: 9G+y.^/6  
     MaskBits&=~ALTBIT; z=[l.Af_  
     break; Slo9#26  
    case VK_CONTROL: )L|C'dJ<k`  
     MaskBits&=~CTRLBIT; 4^`PiRGt  
     break; +{'lZa  
    case VK_SHIFT: v/ eB,p  
     MaskBits&=~SHIFTBIT; 9Dy)nm^  
     break; {DSyV:   
    default: //judge the key and send message 6G$/NW=L  
     break; t+jIHo  
   } hO%Y{Gg  
   for(int index=0;index<MAX_KEY;index++){ we }#Ru*  
    if(hCallWnd[index]==NULL)  Hl!1h%  
     continue; G}s;JJax  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q^vGj</u  
    { SC]6F*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7 s7}?l9  
     bProcessed=TRUE; ,R8n,az  
    } \?r$&K]4  
   } BU'Ki \  
  } f<^ScFVR  
  else if((lParam&0xc000ffff)==1){ //Key down #0jSZg^,"  
   switch(wParam) M&eQ=vew.  
   { *1i?6$[ "  
    case VK_MENU: +J%6bn)U  
     MaskBits|=ALTBIT; W3"vTZJF  
     break; k"0%' Y  
    case VK_CONTROL: ]}_p3W "Y9  
     MaskBits|=CTRLBIT; @h!U  
     break; cxL,]27Bu  
    case VK_SHIFT: s87 a %  
     MaskBits|=SHIFTBIT; vi^z5n  
     break; >'ie!VW@  
    default: //judge the key and send message f(^33k  
     break; ^NY+wR5Sn  
   } <\+Po<)3j  
   for(int index=0;index<MAX_KEY;index++) fmtuFr^a1  
   { yY'gx|\  
    if(hCallWnd[index]==NULL) pb~Ps#"Zg  
     continue; PkjT&e)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -6(h@F%E  
    { 5sG ]3z+1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]aREQ?ma&z  
     bProcessed=TRUE; *X%?3"WH8  
    } sV]i/B  
   } @wg&6uQ  
  } /DK*y S  
  if(!bProcessed){ zUe#Wp[  
   for(int index=0;index<MAX_KEY;index++){ Tw?Pp8'  
    if(hCallWnd[index]==NULL) jM{qRfOrg  
     continue; \MfR #k0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |:~("rA+v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *QMF <ze  
   } Ma% E&.ed  
  } /,=Wy"0TJ  
 } B 9%yd*SJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6wa<'!   
} 8''9@xz  
H't`Q&]a  
BOOL InitHotkey() ~3LhcU-  
{ f<Va<TL6-  
 if(hHook!=NULL){ z?8zFP  
  nHookCount++; J,CJPUf&  
  return TRUE; /+Wb6{lY  
 } Dh*~U :6$g  
 else u]ZqF *  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }w;Q^EU  
  if(hHook!=NULL) B)_!F`9  
   nHookCount++; E|KLK4 ]  
  return (hHook!=NULL); >^M!@=/?J  
} MBnK&GS  
BOOL UnInit() pE9aT5 L  
{ #p11D= @[  
 if(nHookCount>1){ u40b? n.  
  nHookCount--; oVKsic?  
  return TRUE; ]9bh+  
 } -U/I'RDLEz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $}^Rsv(  
 if(unhooked==TRUE){ m0dFA<5-  
  nHookCount=0; gt].rwo"  
  hHook=NULL; }dV9%0s!  
 } uJ2C+$=Ul  
 return unhooked; \c5#\1<  
} 'p4da2%  
BaNU}@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jM|YW*zNZ  
{ PM#$H  
 BOOL bAdded=FALSE; V\e13cL]  
 for(int index=0;index<MAX_KEY;index++){ `?Y_0Nh>  
  if(hCallWnd[index]==0){ d;@E~~o?B]  
   hCallWnd[index]=hWnd; ^sr:N5~z`  
   HotKey[index]=cKey; C*Y :w  
   HotKeyMask[index]=cMask; j TB<E=WC  
   bAdded=TRUE; %fex uy4  
   KeyCount++; wN/*|?`Z  
   break; G}Qk!r  
  } d()zW7}W  
 } =R"Eb1  
 return bAdded; mR!&.R?  
} Q6s5#7h'"  
Kt/+PS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iA1;k*) q  
{ W(]E04  
 BOOL bRemoved=FALSE; Mp DdJ,  
 for(int index=0;index<MAX_KEY;index++){ < e7<t9  
  if(hCallWnd[index]==hWnd){ 5bGjO&$l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J?|K#<%  
    hCallWnd[index]=NULL; yhJA;&}>  
    HotKey[index]=0; *Bb|N--jI  
    HotKeyMask[index]=0; dA_V:HP  
    bRemoved=TRUE; 4EaS g#  
    KeyCount--; .O@q5G  
    break; {7ZtOe  
   } K%aPl~e  
  } #w%a m`+  
 } =+SVzK,+3  
 return bRemoved; ~%8Q75tn.  
} _k"&EW{ Ii  
O=!)})YG  
void VerifyWindow() D-2v>l_  
{ h1G*y  
 for(int i=0;i<MAX_KEY;i++){ Cnc\sMDJ\B  
  if(hCallWnd!=NULL){ lN][xnP  
   if(!IsWindow(hCallWnd)){ 5pKvNLy.t  
    hCallWnd=NULL; \r1kbf7?  
    HotKey=0; GtAJ#[5w  
    HotKeyMask=0; D~i@. k  
    KeyCount--; a@V/sh  
   } 8f6;y1!;  
  } R|Q_W X  
 } GWA!Ab'<U  
} mv9E{m  
="'P=Xh!8  
BOOL CHookApp::InitInstance() yjM@/b  
{ 08d_DCR  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "`$'tk[  
 hins=AfxGetInstanceHandle(); XYxm8ee"j  
 InitHotkey(); 4/-))F&s  
 return CWinApp::InitInstance(); "JQt#[9l  
} r%m7YwXo  
4, *^QK  
int CHookApp::ExitInstance() =|WV^0=S'%  
{ 3A}nNHpN  
 VerifyWindow(); H2FFw-xW  
 UnInit(); DESViQM  
 return CWinApp::ExitInstance(); LGo@F;!n  
} +~i+k~{`H  
!=h|&Vta  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ma]F%E+$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~QEXB*X-g'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w?$u!X  
#if _MSC_VER > 1000 8t*%q+Z  
#pragma once 5w [=  
#endif // _MSC_VER > 1000 ]ZryY EB  
l3Bxi1k[C  
class CCaptureDlg : public CDialog [K4+G]6  
{ 0Z) ;.l^  
 // Construction h,WY2Hr  
 public: D @4&@>  
  BOOL bTray; ~b6<uRnM.  
  BOOL bRegistered; k vgs $  
  BOOL RegisterHotkey(); Y +_5"LV  
  UCHAR cKey; Mn }Z9S[  
  UCHAR cMask; ("J V:u.L+  
  void DeleteIcon(); 1J{z}yPHc  
  void AddIcon(); U)I `:J+A  
  UINT nCount; 1f pS"_}  
  void SaveBmp(); 4gkV]" H!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #Wc #fP  
  // Dialog Data Wru  Fp  
  //{{AFX_DATA(CCaptureDlg) ?m_RU  
  enum { IDD = IDD_CAPTURE_DIALOG }; D`~{[cv)\  
  CComboBox m_Key; iP? ASqo{  
  BOOL m_bControl; 5q_OuZ/6  
  BOOL m_bAlt; z)Q^j>%  
  BOOL m_bShift; FskJyB[  
  CString m_Path; >eG&gc@$1$  
  CString m_Number; QY\wQjwuW  
  //}}AFX_DATA D>7_P7]y  
  // ClassWizard generated virtual function overrides  n wZr3r  
  //{{AFX_VIRTUAL(CCaptureDlg) )Y,?r[4{  
 public: {EoyMJgz  
  virtual BOOL PreTranslateMessage(MSG* pMsg); noUZ9M|hz  
 protected: ,I&0#+}n  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 548 [! p4  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -IE P?NX  
  //}}AFX_VIRTUAL @<TfA>*VJ  
  // Implementation X-N$+[#  
 protected: `TlUJ]d)  
  HICON m_hIcon; 0i Z9a/v  
  // Generated message map functions "O*W]e  
  //{{AFX_MSG(CCaptureDlg) ATmqq)\s  
  virtual BOOL OnInitDialog(); h^_taAdS`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); k]/6/s\  
  afx_msg void OnPaint(); $@qs(Xwr  
  afx_msg HCURSOR OnQueryDragIcon(); %M,d/4=P  
  virtual void OnCancel(); `jQ}^wEgu  
  afx_msg void OnAbout(); &<P^Tvqq&  
  afx_msg void OnBrowse(); v yLAs;  
  afx_msg void OnChange(); v.2Vg  
 //}}AFX_MSG `Ig2f$}  
 DECLARE_MESSAGE_MAP() 5f*'wA  
}; -^jLU FC  
#endif 1DlcO>#@  
V-ouIqnI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ExP25T  
#include "stdafx.h" O"^a.`27  
#include "Capture.h" &P{p\v2Y  
#include "CaptureDlg.h" BSu)O~s  
#include <windowsx.h> 7f Tg97eF  
#pragma comment(lib,"hook.lib") HFx"fT  
#ifdef _DEBUG vwH7/+  
#define new DEBUG_NEW .q9|XDqQc  
#undef THIS_FILE $E,DxDT  
static char THIS_FILE[] = __FILE__; ic]tUOC:  
#endif )4_6\VaM  
#define IDM_SHELL WM_USER+1 .yfqS|(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .nF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $0S"Lh{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j _9<=Vu  
class CAboutDlg : public CDialog ,Ho.O7H  
{ I.0P7eA-  
 public: ;$L!`"jn  
  CAboutDlg(); S1= JdN  
  // Dialog Data {ZM2WFpE  
  //{{AFX_DATA(CAboutDlg) PM<LR?PLc  
  enum { IDD = IDD_ABOUTBOX }; ApJf4D<V  
  //}}AFX_DATA xOyL2   
  // ClassWizard generated virtual function overrides P5xmLefng  
  //{{AFX_VIRTUAL(CAboutDlg) 3pv1L~ ZI  
 protected: L8tLW09  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^RAFmM#F  
  //}}AFX_VIRTUAL .QQI~p0:  
  // Implementation t{s*3k/  
 protected: O#5( U. E  
  //{{AFX_MSG(CAboutDlg) cA SHgm  
  //}}AFX_MSG +M]8_kE=+l  
  DECLARE_MESSAGE_MAP() S=amjcC  
}; |j}F$*SE[  
J$/BH\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wBHDof xX  
{ [gdPHXs  
 //{{AFX_DATA_INIT(CAboutDlg) Ml/p{ *p  
 //}}AFX_DATA_INIT J+NK+,_*M  
} Ry S{@=si  
@d^h/w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gI5nWEM0{  
{ Q!e0Vb  
 CDialog::DoDataExchange(pDX); 49fq6ZhO  
 //{{AFX_DATA_MAP(CAboutDlg) <m:wuNEM  
 //}}AFX_DATA_MAP M*6@1.n  
} NP'DuzC  
4"(zi5`e  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) OLup`~  
 //{{AFX_MSG_MAP(CAboutDlg) G(\1{"!  
 // No message handlers }~'Wz*Gm  
 //}}AFX_MSG_MAP "}+/ 0$F  
END_MESSAGE_MAP() ;L%~c4`l~m  
vGHYB1=~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) T>%ny\?tHW  
: CDialog(CCaptureDlg::IDD, pParent) fToI,FA  
{ 5 t?2B]  
 //{{AFX_DATA_INIT(CCaptureDlg) sLqvDH?V  
  m_bControl = FALSE; Rs[]i;  
  m_bAlt = FALSE; LhRe?U\  
  m_bShift = FALSE; *+Q*&-$  
  m_Path = _T("c:\\"); l{o{=]x1  
  m_Number = _T("0 picture captured."); K/+C6Y?  
  nCount=0; 10IPq#Jj  
  bRegistered=FALSE; c+/C7C o  
  bTray=FALSE; iQ"F`C  
 //}}AFX_DATA_INIT `#8R+c=$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ht^2)~e~:  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Py]ci`27  
} +M&S  
Y mjS!H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r+p jv_R  
{ NT/B4'_@  
 CDialog::DoDataExchange(pDX); iX6jvnJ:/  
 //{{AFX_DATA_MAP(CCaptureDlg) ,6Q-k4_  
  DDX_Control(pDX, IDC_KEY, m_Key); l*H"]6cXRL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); n1(X%%2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); &)jZ|Q~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); B&N&eRAE  
  DDX_Text(pDX, IDC_PATH, m_Path); Ka\b_P&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u*N8s[s'  
 //}}AFX_DATA_MAP DJ0T5VE W3  
} \%Q rN+WQ  
lB~'7r`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $i>VI  
//{{AFX_MSG_MAP(CCaptureDlg) M?zAkHNS$  
 ON_WM_SYSCOMMAND() 't.F.t  
 ON_WM_PAINT() g^UWf<xp  
 ON_WM_QUERYDRAGICON() S]=Vr%irX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) NYvj?>[y  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gSYX@'Q!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h18y?e7MU  
//}}AFX_MSG_MAP U/o}{,$A  
END_MESSAGE_MAP() Nb/%>3O@  
fEv36xb2S  
BOOL CCaptureDlg::OnInitDialog() :ygz/L  
{ nW'x#0-  
 CDialog::OnInitDialog(); _u2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); S]/ +n>  
 ASSERT(IDM_ABOUTBOX < 0xF000); D07u?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *S_Iza #&x  
 if (pSysMenu != NULL) y<d#sv(s  
 { KZfRiCZ  
  CString strAboutMenu; 0*x?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7b2<, .E  
  if (!strAboutMenu.IsEmpty()) `_^=OOn  
  { Fsj[JE  
   pSysMenu->AppendMenu(MF_SEPARATOR); yo?Q%w'Nh  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UdJV;T'rm  
  } :q1r2&ne  
 } $7d"9s\$"  
 SetIcon(m_hIcon, TRUE); // Set big icon $u"$mg7x  
 SetIcon(m_hIcon, FALSE); // Set small icon p n>`v   
 m_Key.SetCurSel(0); R,1,4XT  
 RegisterHotkey(); ^0-=(JrC  
 CMenu* pMenu=GetSystemMenu(FALSE); pk1M.+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hiHp@"l<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?='9YM  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \9QOrjiw  
 return TRUE; // return TRUE unless you set the focus to a control V1A3l{>L  
} -#x\E%v.F  
.y+U7 "?s*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) u`|fmVI  
{ P$I\)Q H  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =C)1NJx&~  
 { !F)oX7"  
  CAboutDlg dlgAbout; ;D:T ^4  
  dlgAbout.DoModal(); }*.*{I  
 } _AYF'o-Cm  
 else 'DQyB`V2y  
 { pASVnXJZ  
  CDialog::OnSysCommand(nID, lParam); n\Ixv  
 } S &u94hlC  
} m.1BLN[9  
i>2_hn_UR  
void CCaptureDlg::OnPaint() e,8-P-h~T  
{ cC.DBYV+-  
 if (IsIconic()) R 0}%   
 { sXu+F2O  
  CPaintDC dc(this); // device context for painting I&Y(]S,cU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9#!tzDOtD  
  // Center icon in client rectangle nT"z(\i.!J  
  int cxIcon = GetSystemMetrics(SM_CXICON); {+Yo&F}n  
  int cyIcon = GetSystemMetrics(SM_CYICON); Dy!fwYPA/{  
  CRect rect; p;Kr664  
  GetClientRect(&rect); qE{S'XyM,  
  int x = (rect.Width() - cxIcon + 1) / 2; ]XU#i#;c  
  int y = (rect.Height() - cyIcon + 1) / 2; (xL=X%6a  
  // Draw the icon /$(D>KU  
  dc.DrawIcon(x, y, m_hIcon); vNGvEJ`qn  
 } ( Iew%U  
 else W:\VFP f2  
 { gzF&7trN  
  CDialog::OnPaint(); .~J^`/o  
 } ^ZG1  
} NY x4& *le  
t/|^Nt@XT  
HCURSOR CCaptureDlg::OnQueryDragIcon() Di*>PE@  
{ 6-"&jbvm  
 return (HCURSOR) m_hIcon; :xCobMs_/  
} 2|BE{91  
-; }Wm[  
void CCaptureDlg::OnCancel() 6EY4@0%A  
{ c&&UT-Z  
 if(bTray) #Gx@\BE{  
  DeleteIcon(); X;h~s:LM  
  CDialog::OnCancel(); y1X.Mvc  
} whCv9)x  
v(`$%V.  
void CCaptureDlg::OnAbout() ?9+;[X  
{ vaL-Mi(_  
 CAboutDlg dlg; z@~rm9d  
 dlg.DoModal();  t2iFd?  
} =%LS9e^7D  
Gj=il-Po  
void CCaptureDlg::OnBrowse() Ry C7  
{ 8@-US , |  
 CString str; A7H=#L+C  
 BROWSEINFO bi; AI2CfH#:C  
 char name[MAX_PATH]; P6Ei!t,>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x% 1Rp[  
 bi.hwndOwner=GetSafeHwnd(); _qV_(TpS+  
 bi.pszDisplayName=name; V QI7lJV"  
 bi.lpszTitle="Select folder"; ;G$FLL1   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; yrw!b\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #'qW?8d}  
 if(idl==NULL) 1a<~Rmcil  
  return; 2 O%UT?R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); dImm},  
 str.ReleaseBuffer(); b11C3TyQT  
 m_Path=str; sC>8[Jatd  
 if(str.GetAt(str.GetLength()-1)!='\\') lgl/| ^ Uw  
  m_Path+="\\"; ;XT$rtuX  
 UpdateData(FALSE); r_G`#Z_5F  
} !SnpesTn  
tBrVg<]t  
void CCaptureDlg::SaveBmp() bTj,5,8 i  
{ k.%F!sK  
 CDC dc; m`Z4#_s2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 8Xr"4;}f+  
 CBitmap bm; C}CX n X  
 int Width=GetSystemMetrics(SM_CXSCREEN); R##O9BSI8Z  
 int Height=GetSystemMetrics(SM_CYSCREEN); y03l_E,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); pS0T>r  
 CDC tdc; vsK>?5{C-  
 tdc.CreateCompatibleDC(&dc); H X8q+  
 CBitmap*pOld=tdc.SelectObject(&bm); 6*$N@>8&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); FE`J.aw^X  
 tdc.SelectObject(pOld); XZhhr1-<a  
 BITMAP btm; %Xn)$Ti ~<  
 bm.GetBitmap(&btm); N}\i!YUD  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NJ.kT uk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <T['J]k%  
 BITMAPINFOHEADER bih; q07>FW R  
 bih.biBitCount=btm.bmBitsPixel; ;RXv%ML  
 bih.biClrImportant=0; ]Sh&8 #  
 bih.biClrUsed=0; ][3 "xP  
 bih.biCompression=0; ctf'/IZ5  
 bih.biHeight=btm.bmHeight; !|D,cs  
 bih.biPlanes=1;  u!(|y9p  
 bih.biSize=sizeof(BITMAPINFOHEADER); |$Td-M^)  
 bih.biSizeImage=size; CXa$QSu>  
 bih.biWidth=btm.bmWidth; ~/t# J  
 bih.biXPelsPerMeter=0; 6`'^$wKs  
 bih.biYPelsPerMeter=0; di"*K*~y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }+z}vb  
 static int filecount=0; fYwumx`J  
 CString name; pcE.  
 name.Format("pict%04d.bmp",filecount++); gbvBgOp  
 name=m_Path+name; t^q/'9Ai&J  
 BITMAPFILEHEADER bfh; `| fF)kI  
 bfh.bfReserved1=bfh.bfReserved2=0; "YivjHa7H  
 bfh.bfType=((WORD)('M'<< 8)|'B'); K.z@Vx.  
 bfh.bfSize=54+size; %lujme  
 bfh.bfOffBits=54; @^%# ]x,:  
 CFile bf; _b+3;Dy  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t<4+CC2H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); K~uoZ~_gA  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *Nv<,Br,F  
  bf.WriteHuge(lpData,size); Xh ?{%?2  
  bf.Close(); T+I|2HYqOj  
  nCount++; cB|](gWS~  
 } 9vXrC_W9  
 GlobalFreePtr(lpData); <3i!{"}  
 if(nCount==1) gX[6WB"p  
  m_Number.Format("%d picture captured.",nCount); y<)x`&pcD  
 else f+rBIE  
  m_Number.Format("%d pictures captured.",nCount); iKu5K0x{>I  
  UpdateData(FALSE); {L#Pdj{  
} h>4\I;Ij  
XWkYhTaY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <|v]9`'  
{ YS/4<QA[  
 if(pMsg -> message == WM_KEYDOWN) AtSEKpKc  
 { ^s^X nQhE  
  if(pMsg -> wParam == VK_ESCAPE) nfc&.(6x<  
   return TRUE; Jg@PhN<9  
  if(pMsg -> wParam == VK_RETURN) ALhu\x>AY  
   return TRUE; ;%Qu;FtC  
 } S^3I"B  
 return CDialog::PreTranslateMessage(pMsg); 1Eh (U  
} dH8H<K~  
9T)-|fja_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C/)Xd^#  
{ 5K,Y6I&$SJ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W}Z'zU?[  
  SaveBmp(); d>2>mT$U  
  return FALSE; f"z96{zo  
} @X|CubJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  E;k'bz  
 CMenu pop; 9%|!+!j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .QW89e,O3  
 CMenu*pMenu=pop.GetSubMenu(0); jfk`%C Ek=  
 pMenu->SetDefaultItem(ID_EXITICON); M5wj79'l"  
 CPoint pt; ^dQ#\uy  
 GetCursorPos(&pt); moh7:g  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Nb-;D)W;B  
 if(id==ID_EXITICON) 1I_(!F{Ho  
  DeleteIcon(); ~h -0rE  
 else if(id==ID_EXIT) < f1Pj  
  OnCancel(); M*|x,K=U  
 return FALSE; 2-FL&DE  
} ;:f.a(~c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ;8H m#p7,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _8S!w>$)  
 AddIcon(); P/4]x@{ih  
 return res; [*@"[u   
} 4;x{@Ln  
Yz4Q!tL  
void CCaptureDlg::AddIcon() >IsRd  
{ |.X?IJ`  
 NOTIFYICONDATA data; 1Jt5|'tl  
 data.cbSize=sizeof(NOTIFYICONDATA); _dj_+<Y?  
 CString tip; }!x\qpA  
 tip.LoadString(IDS_ICONTIP); u`3J2 ,.  
 data.hIcon=GetIcon(0); )bXiw3'A  
 data.hWnd=GetSafeHwnd(); I!~5.  
 strcpy(data.szTip,tip); k68\ _NUL  
 data.uCallbackMessage=IDM_SHELL; -b8Vz}Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ckS.j)@.c  
 data.uID=98; 5?{a=r9  
 Shell_NotifyIcon(NIM_ADD,&data); 2/3,%5j_  
 ShowWindow(SW_HIDE); ,,OO2EgZ`  
 bTray=TRUE; pri=;I(2A  
} 4u0=/pfi[  
K} LmU{/t/  
void CCaptureDlg::DeleteIcon() xx_]e4  
{ g?qm >X  
 NOTIFYICONDATA data; 1ve %xF  
 data.cbSize=sizeof(NOTIFYICONDATA); HTA Jn_  
 data.hWnd=GetSafeHwnd(); e<#t]V  
 data.uID=98; 9 "7(Jq  
 Shell_NotifyIcon(NIM_DELETE,&data); l~.ae,|7  
 ShowWindow(SW_SHOW); zuwlVn  
 SetForegroundWindow(); F|Pf-.r`t  
 ShowWindow(SW_SHOWNORMAL); akoK4!z  
 bTray=FALSE; +iY.YV  
} R.-2shOE'  
@lRTp  
void CCaptureDlg::OnChange() x4Q*~,n  
{ 9KkxUEkW  
 RegisterHotkey(); LB1LQ 0M  
} hOG9  
[@(M%  
BOOL CCaptureDlg::RegisterHotkey() Bvb.N$G  
{ 4$ya$Y%s%  
 UpdateData(); Js.2R$o =*  
 UCHAR mask=0;  Y[#EFM  
 UCHAR key=0; }rRf4te  
 if(m_bControl) @i U@JE`C  
  mask|=4; qbrY5;U  
 if(m_bAlt) 5)bf$?d   
  mask|=2; ZCVwQ#Xe+  
 if(m_bShift) )RG@D\t,  
  mask|=1; 0]p! Bscaf  
  key=Key_Table[m_Key.GetCurSel()]; ji9 (!G  
 if(bRegistered){ "^Y)&<J&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {}RE;5n\['  
  bRegistered=FALSE; PT4Wox9U  
 } 6aRPm%  
 cMask=mask; <pyLWmO  
 cKey=key; ~$cz`A  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B >2"O  
 return bRegistered; ]zK'aod  
} B)>r~v]  
cAnL,?_v  
  四、小结 uyZ  
P@lDhzd  
  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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