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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:  ZC^C  
  b1^n KB  
  一、实现方法 Y\/gU8w/  
":?T%v>  
  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: ^ DAa%u  
eo#^L}  
#pragma data_seg("shareddata") r@)A k  
HHOOK hHook =NULL; //钩子句柄 GtI6[ :1t  
UINT nHookCount =0; //挂接的程序数目 &;q<M_<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :_dICxaLZT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 nX%AeDBAT  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W,hWOO  
static int KeyCount =0; Z&yaSB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &w~Xa( uu  
#pragma data_seg() =F%RLpNU4  
q{4|Kpx@  
  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。 t)1phg4H)  
q@#BPu"\l  
  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;{~n?  
Db03Nk>#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR sroGER .  
cKey,UCHAR cMask) U :9=3A2$x  
{ aSnp/g  
 BOOL bAdded=FALSE; f$xhb3Qn  
 for(int index=0;index<MAX_KEY;index++){ &&RA4  
  if(hCallWnd[index]==0){ DR+,Y2!_GT  
   hCallWnd[index]=hWnd; ,=w!vO5s  
   HotKey[index]=cKey; {/M\Q@j  
   HotKeyMask[index]=cMask; ~5#)N{GbY  
   bAdded=TRUE; wgd<3 X  
   KeyCount++; 99ASIC!  
   break; %JoxYy-  
  } , r+"7$  
 } 'wQy]zm$  
 return bAdded; M23& <}Q8  
} 4Z%Y"PL(K  
//删除热键 u35q,u=I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !ng\` |8?  
{ 2>y:N.  
 BOOL bRemoved=FALSE; ,Q2N[Jwd$  
 for(int index=0;index<MAX_KEY;index++){ =Lw3 \5l  
  if(hCallWnd[index]==hWnd){ 0^<,(]!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ P1d,8~;  
    hCallWnd[index]=NULL; 1i?=JAFfM  
    HotKey[index]=0; Kmry=`=A  
    HotKeyMask[index]=0; N~#D\X^t.  
    bRemoved=TRUE; ?eWJa  
    KeyCount--; 23E 0~O  
    break; }$)&{d G  
   } i-13~Dk  
  } 5Hle-FDn9  
 } .ewZV9P)t  
 return bRemoved; d(l|hmj4j9  
} %-^}45](q  
STT2o=   
kEAhTh&g*  
  DLL中的钩子函数如下: t"YIq/08  
BjD&> gO)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [@.B4p  
{ NNX% Bq  
 BOOL bProcessed=FALSE; O)5 #Fcp(  
 if(HC_ACTION==nCode) 6&],WGz  
 { 3X'WR]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 o>u!CL<  
   switch(wParam) .~<]HAwq  
   {  DT? m/*  
    case VK_MENU: 9t }xXk  
     MaskBits&=~ALTBIT; 6lU|mJ`M  
     break; 1o#vhk/ "+  
    case VK_CONTROL: I@PJl  
     MaskBits&=~CTRLBIT; TzY!D *%z  
     break; s`Vf+ l0  
    case VK_SHIFT: SKx e3  
     MaskBits&=~SHIFTBIT; h ]}`@M"  
     break; @zs1>\J7  
    default: //judge the key and send message !fZLQc  
     break; W?PWJkIw  
   } 44Qk;8*  
   for(int index=0;index<MAX_KEY;index++){ ^Jtl;Q  
    if(hCallWnd[index]==NULL) @U7Dunu*f  
     continue; syMm`/*/G-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z@`@I  
    { yM17H\=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i@{*O@m  
     bProcessed=TRUE; `r.N  
    } .nPL2zO  
   } KL~AzLI  
  } J" wKRy  
  else if((lParam&0xc000ffff)==1){ //有键按下 \)GR\~z0h  
   switch(wParam) +/Z0  
   { $O]^Xm3{@  
    case VK_MENU: <[5#c*A  
     MaskBits|=ALTBIT; - #Jj-t_Fe  
     break; MBv/  
    case VK_CONTROL: mrReast  
     MaskBits|=CTRLBIT; pg5&=  
     break; r4S=I   
    case VK_SHIFT: u7 ~mn l  
     MaskBits|=SHIFTBIT; #-dK0<:  
     break; J;HkTT   
    default: //judge the key and send message a'^0.1  
     break; %O Fj  
   } kpWzMd &RK  
   for(int index=0;index<MAX_KEY;index++){ UC;=)  
    if(hCallWnd[index]==NULL) @|]G0&gn&?  
     continue; f:FpyCo=9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) omT(3)TP  
    { m/" J s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 'M lXnHxt  
     bProcessed=TRUE; Ir>2sTrm  
    } q@w"yz>  
   } %U:C|  
  } /6smVz@O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [^Q&suy  
   for(int index=0;index<MAX_KEY;index++){ V:QdQ;c  
    if(hCallWnd[index]==NULL)  "YD.=s  
     continue; PgTDjEo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n8Q* _?Z/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `_ 0)kdu  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mMslWe  
   } K~$35c3M  
  } J[MVE4&  
 } 5C* ?1& !  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lf;~5/%wMG  
} >0 7shNX  
%/X2 l  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: M-vC>u3Y  
dUZ$wbV%h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "W3W:vl!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8Y7 @D$=w  
RpULm1b  
  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: qZ233pc  
q'by;g*m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) wJ/ ~q)  
{ QW,cn7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) G}s;JJax  
 { *J.c $1#h  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ` v>/  
  SaveBmp(); Z%KL[R}^w;  
  return FALSE; /^~p~HKtx  
 } ZHb7+  
 …… //其它处理及默认处理 aQxe)  
} g&q^.7c}  
sK#H4y+<  
#0jSZg^,"  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 CJ0$;et  
f>p; siR)  
  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。 EgFl="0  
R !jhwY$  
  二、编程步骤 ]}_p3W "Y9  
+BU0 6lLD  
  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"; s87 a %  
4 iik5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;B*L1'FF%t  
D\n>*x  
  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; )_X;9%L7  
fmtuFr^a1  
  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; tsB.oDMP  
$#TID=  
  5、 添加代码,编译运行程序。 +}&pVe\t  
7 FEzak'  
三、程序代码 U`:lAG  
zwKg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL vM5k4%D  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }<E sS  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ loml.e=87  
#if _MSC_VER > 1000 o-L|"3 P  
#pragma once 1hF2eNh  
#endif // _MSC_VER > 1000 WW)_Wh  
#ifndef __AFXWIN_H__ MacL3f  
#error include 'stdafx.h' before including this file for PCH ;|Y2r^c  
#endif 6'S5sRA  
#include "resource.h" // main symbols E=$7ieW  
class CHookApp : public CWinApp IiG4ib>)W  
{ 8''9@xz  
 public: .WxFm@]/\  
  CHookApp(); @ARAX\F  
  // Overrides ?psOj%  
  // ClassWizard generated virtual function overrides rOs)B21/  
  //{{AFX_VIRTUAL(CHookApp) P9 W<gIO  
 public: Sn;/;^@(\  
  virtual BOOL InitInstance(); Wh#os,U$  
  virtual int ExitInstance(); ;4+qPWwq8W  
  //}}AFX_VIRTUAL E!:.G+SEl  
  //{{AFX_MSG(CHookApp) >^M!@=/?J  
  // NOTE - the ClassWizard will add and remove member functions here. U@1#!ZZ6  
  // DO NOT EDIT what you see in these blocks of generated code ! pE9aT5 L  
  //}}AFX_MSG iuvtj]/  
  DECLARE_MESSAGE_MAP() XHU<4l:kl  
}; *?EjYI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); H[>klzh6 !  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $}^Rsv(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .Y=Z!Q  
BOOL InitHotkey(); JS<e`#c&  
BOOL UnInit(); -MVNXAKnZ  
#endif (:tTx>V#  
'p4da2%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Fm-q=3  
#include "stdafx.h" UXcH";*9b  
#include "hook.h" 7J #g1  
#include <windowsx.h> |H3?ox*  
#ifdef _DEBUG d;@E~~o?B]  
#define new DEBUG_NEW #n6FQ$l8m  
#undef THIS_FILE Pf^Ly 97  
static char THIS_FILE[] = __FILE__; \@iOnRuHn9  
#endif e<: 4czh8  
#define MAX_KEY 100 gPA>*;?E;@  
#define CTRLBIT 0x04 d()zW7}W  
#define ALTBIT 0x02 !W+p<F1i  
#define SHIFTBIT 0x01 N]O{T_5-0  
#pragma data_seg("shareddata") 1{;[q3a  
HHOOK hHook =NULL; s[vPH8qb  
UINT nHookCount =0; S'v V"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey LOyCx/n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT f4A4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SNopAACf1  
static int KeyCount =0; ai<MsQQ:=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ppi-skT  
#pragma data_seg() q.u[g0h;  
HINSTANCE hins; 4EaS g#  
void VerifyWindow(); I8pv:>EhC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) gKm@B{rC  
//{{AFX_MSG_MAP(CHookApp) $Hl+iF4j<  
// NOTE - the ClassWizard will add and remove mapping macros here. hPEp0("  
// DO NOT EDIT what you see in these blocks of generated code! $)kBz*C[  
//}}AFX_MSG_MAP _k"&EW{ Ii  
END_MESSAGE_MAP() <MWXew7b  
2f}K #i8   
CHookApp::CHookApp() D-2v>l_  
{ X+'^ Sp  
 // TODO: add construction code here, ~t.WwxY+  
 // Place all significant initialization in InitInstance rhzv^t  
} 5pKvNLy.t  
o\=i0HR9  
CHookApp theApp; J;Z>fAE7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |R &3/bEr  
{ mV! @oNCK  
 BOOL bProcessed=FALSE; \h'E5LO  
 if(HC_ACTION==nCode) XeIUdg4>R  
 { Zh fD`@>&  
  if((lParam&0xc0000000)==0xc0000000){// Key up GP7) m  
   switch(wParam) BC$;b>IUA  
   { S$kuhK>W!  
    case VK_MENU: nDoiG#N0  
     MaskBits&=~ALTBIT; iz%A0Z+`bg  
     break; NP<F==,  
    case VK_CONTROL: r%m7YwXo  
     MaskBits&=~CTRLBIT; 8KL_PwRX_f  
     break; |)72E[lL  
    case VK_SHIFT: n.)[MC}  
     MaskBits&=~SHIFTBIT; /v;)H#;  
     break; H-\ {w    
    default: //judge the key and send message f2w=ln  
     break; *?R\[59  
   } hB GGs  
   for(int index=0;index<MAX_KEY;index++){ 9,EaN{GM  
    if(hCallWnd[index]==NULL) Uf2v$Jl+Yh  
     continue; lu@>?,<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VM V]TPks>  
    { Jq+$_Uqd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h<^:Nn  
     bProcessed=TRUE; *|,ykb>  
    } wMPw/a;  
   } "<jEI /  
  } r~D~7MNl  
  else if((lParam&0xc000ffff)==1){ //Key down k vgs $  
   switch(wParam) pJ*#aH[ySP  
   { @BHS5^|  
    case VK_MENU: yzM+28}L<I  
     MaskBits|=ALTBIT;  1u S>{M  
     break; UA!Gr3  
    case VK_CONTROL: D8D!16_  
     MaskBits|=CTRLBIT; s eZ<52f2  
     break; Vw;ldEdx  
    case VK_SHIFT: E][{RTs  
     MaskBits|=SHIFTBIT; h@m n GE  
     break; PVkN3J  
    default: //judge the key and send message Uh|__DUkh  
     break; 3!oQmG_T  
   } >eG&gc@$1$  
   for(int index=0;index<MAX_KEY;index++) /4B4IT  
   { L..X)-D2 n  
    if(hCallWnd[index]==NULL) ,<P[CUD&&  
     continue; 9M7(_E;)B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kW2nrkF  
    { Zqs-I8y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [ls ?IFg  
     bProcessed=TRUE; =Z>V}`n  
    } tId !C  
   } Rn~Xu)@e  
  } R,5$ 0_]|+  
  if(!bProcessed){ `7qp\vYL  
   for(int index=0;index<MAX_KEY;index++){ e9_O/iN  
    if(hCallWnd[index]==NULL) ,pa&he  
     continue; QH' [ (  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6[h$r/GXh"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %Rsf6rJ  
   } v yLAs;  
  } o(>-:l i0  
 } .kKwdqO+zB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eeJt4DV8v  
} +-!|%jG`%v  
ExP25T  
BOOL InitHotkey() CygV_q  
{ PUZXmnB  
 if(hHook!=NULL){ c'#J{3d  
  nHookCount++; X@AkA9'fq  
  return TRUE; ^'I5]cRa  
 } .q9|XDqQc  
 else q>:&xR"ra  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;1g-z]  
  if(hHook!=NULL) (F '  
   nHookCount++; +$QL0|RL  
  return (hHook!=NULL); Ufe  
} rUpAiZfz >  
BOOL UnInit() 8!%"/*P$  
{ j% USu+&  
 if(nHookCount>1){ Cz);mOb%M%  
  nHookCount--; #M^Yh?~%w  
  return TRUE; [O+^eE6h  
 } S1= JdN  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2[&-y[1  
 if(unhooked==TRUE){ "X(=  
  nHookCount=0; e, 0I~:  
  hHook=NULL; V1#aDfiW  
 } V\`= "  
 return unhooked; cTa D{!zm5  
} @gjdyz  
M@X#[w:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) G{Enh<V  
{ UG'U D"  
 BOOL bAdded=FALSE; ^t ldm7{_  
 for(int index=0;index<MAX_KEY;index++){ ftH%, /,  
  if(hCallWnd[index]==0){ {BCj VmY  
   hCallWnd[index]=hWnd; z slEUTj)  
   HotKey[index]=cKey; wBHDof xX  
   HotKeyMask[index]=cMask; wVJFA1  
   bAdded=TRUE; J'c9577$  
   KeyCount++; k Q(y^tW  
   break; \ J:T]  
  } gI5nWEM0{  
 } b-zX3R;  
 return bAdded; (<JDD]J  
} yi;t  
[_hhC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4"(zi5`e  
{ j"u)/A8*  
 BOOL bRemoved=FALSE; xy3%z  
 for(int index=0;index<MAX_KEY;index++){ v!h-h&p O7  
  if(hCallWnd[index]==hWnd){ ({nSs5)$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F-,{+B66  
    hCallWnd[index]=NULL; AX RNV  
    HotKey[index]=0; xLK0~|_#!  
    HotKeyMask[index]=0; VX[!Vh  
    bRemoved=TRUE; gbf=H8]  
    KeyCount--; =?Md&%j  
    break; $cU/Im`  
   } X3O$Sd(D  
  } SY)$2RC+}  
 } ",V5*1w  
 return bRemoved; YY~=h5$  
} /(pChY>  
BIf].RY  
void VerifyWindow() X )s7_  
{ ~'.yhPo g  
 for(int i=0;i<MAX_KEY;i++){ mM{v>Em2K#  
  if(hCallWnd!=NULL){ ucPMT0k  
   if(!IsWindow(hCallWnd)){ k K|+W,  
    hCallWnd=NULL; m e{SVG{  
    HotKey=0; .LR>&N_U  
    HotKeyMask=0; &)jZ|Q~  
    KeyCount--;  PuCA @qY  
   } :Ia&,;Gc  
  } #de^~  
 } DJ0T5VE W3  
} Wj=ex3K3u.  
:]Qx T8B  
BOOL CHookApp::InitInstance() dKpa5f7  
{ g"? D>}@=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?+=|{{l  
 hins=AfxGetInstanceHandle(); >D62l*VC)  
 InitHotkey(); n`Iy7X  
 return CWinApp::InitInstance(); h18y?e7MU  
} " <a|Q,!  
7!nAWlQ&-E  
int CHookApp::ExitInstance() =W*`HV-w  
{ z5vI0 N$  
 VerifyWindow(); _u2  
 UnInit(); >{Z=cv/6o  
 return CWinApp::ExitInstance(); p;=(-4\V}  
} )1 j2  
Pv.@Y 30  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0*x?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) lIP<`6=4  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ In M'zAhb  
#if _MSC_VER > 1000 L(8dK  
#pragma once 0Jh:6F  
#endif // _MSC_VER > 1000 mP[u[|]  
@{lnfOESl  
class CCaptureDlg : public CDialog >;W(Jb7e  
{ $u"$mg7x  
 // Construction 4HE4e  
 public: :zRboqe(cc  
  BOOL bTray; Q*(o;\s  
  BOOL bRegistered; Tj9q(Vq  
  BOOL RegisterHotkey(); e|yuPd  
  UCHAR cKey; ZE` {J =,  
  UCHAR cMask; LWV`xCr8R  
  void DeleteIcon(); nTKfwIeg5  
  void AddIcon(); L{p-'V  
  UINT nCount; `,d7_#9'  
  void SaveBmp(); $8r:&Iw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 3k^jR1  
  // Dialog Data G].KJ5,y  
  //{{AFX_DATA(CCaptureDlg) 4/>={4Y9  
  enum { IDD = IDD_CAPTURE_DIALOG }; O_^h 7   
  CComboBox m_Key; qDAjW)w Jp  
  BOOL m_bControl; qr6jn14.c  
  BOOL m_bAlt; Y\sjm]_  
  BOOL m_bShift; Lai"D[N  
  CString m_Path; Z- (HDn  
  CString m_Number; `0:@`)&g1  
  //}}AFX_DATA g"Bv!9*H  
  // ClassWizard generated virtual function overrides C<>.*wlp=  
  //{{AFX_VIRTUAL(CCaptureDlg) }DaYO\:yK*  
 public: e IA=?k.y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ^ BKr0~4A  
 protected: ,qB081hPG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >k|[U[@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e.V){}{V  
  //}}AFX_VIRTUAL VIzZmd  
  // Implementation >qA&;M  
 protected: 'zK*?= ^jk  
  HICON m_hIcon; /$(D>KU  
  // Generated message map functions KK</5Aw9p  
  //{{AFX_MSG(CCaptureDlg) DAW%?(\,  
  virtual BOOL OnInitDialog(); W(YJz#]6_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); f6 nltZ  
  afx_msg void OnPaint(); ^ZG1  
  afx_msg HCURSOR OnQueryDragIcon(); e$=|-J z  
  virtual void OnCancel(); =P{RHhWy;  
  afx_msg void OnAbout(); }q9f,mz  
  afx_msg void OnBrowse(); Hr$5B2'  
  afx_msg void OnChange(); S# #W_OlrI  
 //}}AFX_MSG ^ a:F*<D  
 DECLARE_MESSAGE_MAP() if>] )g2lr  
}; *OiHrI9y  
#endif #SueT"F  
4a-wGx#h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file v(`$%V.  
#include "stdafx.h" 1 <+^$QL  
#include "Capture.h" vaL-Mi(_  
#include "CaptureDlg.h" Q*: Ow]  
#include <windowsx.h> 1o%Hn"uG  
#pragma comment(lib,"hook.lib") {Hu0  
#ifdef _DEBUG 16vfIUtb  
#define new DEBUG_NEW zeX?]@]Y  
#undef THIS_FILE )Pq.kn{Sp  
static char THIS_FILE[] = __FILE__; zVu}7v()  
#endif h*LIS@&9C5  
#define IDM_SHELL WM_USER+1 EX_& wep@1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]7;;uhn`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K#jm6Xh?E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; T[~X~dqwn"  
class CAboutDlg : public CDialog #'qW?8d}  
{ ,P^"X5$   
 public: wr`eBPu  
  CAboutDlg(); iYnt:C  
  // Dialog Data _EP}el  
  //{{AFX_DATA(CAboutDlg) 8J} J;Ga  
  enum { IDD = IDD_ABOUTBOX }; O);V{1P  
  //}}AFX_DATA 6%TV X  
  // ClassWizard generated virtual function overrides eC?N>wHH  
  //{{AFX_VIRTUAL(CAboutDlg) Y%3j >_\;  
 protected: bTj,5,8 i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dSbV{*B;>  
  //}}AFX_VIRTUAL =B 9U  
  // Implementation Wxjpe4  
 protected: v!2`hq O  
  //{{AFX_MSG(CAboutDlg) 5s;#C/ZZ  
  //}}AFX_MSG a^BD55d?  
  DECLARE_MESSAGE_MAP() RaAq>B WPr  
}; 3I]5DW %-  
eX\t]{\oC  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) YpJzRm{Ra  
{ [eImP V]  
 //{{AFX_DATA_INIT(CAboutDlg) zC7;Zj*k  
 //}}AFX_DATA_INIT Lxl?6wZ  
} HO"(eDW6z  
7 UR)4dYA  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?G@%haqn6  
{ "='|c-x  
 CDialog::DoDataExchange(pDX); C4y<+G.`  
 //{{AFX_DATA_MAP(CAboutDlg) Mvux=Ws  
 //}}AFX_DATA_MAP - 0zo>[c/p  
} @Z)&3ss  
>Q YxX<W  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !)GPI?{^5  
 //{{AFX_MSG_MAP(CAboutDlg) bkb}M)C  
 // No message handlers Z=#!FZ{  
 //}}AFX_MSG_MAP OnG?@sW+4!  
END_MESSAGE_MAP() d/e9LK  
t^q/'9Ai&J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) YPN|qn(  
: CDialog(CCaptureDlg::IDD, pParent) IySlu^a  
{ ,W.O*vCA  
 //{{AFX_DATA_INIT(CCaptureDlg) D`u{U]  
  m_bControl = FALSE; _b+3;Dy  
  m_bAlt = FALSE; Gb"PMai  
  m_bShift = FALSE; BJqM=<nQ  
  m_Path = _T("c:\\"); d< y B ~Y  
  m_Number = _T("0 picture captured."); ,\VNs'j  
  nCount=0; N7|ctO  
  bRegistered=FALSE; &4DWLI  
  bTray=FALSE; 0'gJSrgNI  
 //}}AFX_DATA_INIT IlH*s/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {9(N?\S1`a  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); #6JG#!W  
} {L#Pdj{  
'E9\V\bi  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !O*\|7A(  
{ $#CkI09  
 CDialog::DoDataExchange(pDX); ^s^X nQhE  
 //{{AFX_DATA_MAP(CCaptureDlg) 8kk$:8  
  DDX_Control(pDX, IDC_KEY, m_Key); K1Uur>Pk%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <MoWS9s!yb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); xand%XNv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ZZ.GpB.  
  DDX_Text(pDX, IDC_PATH, m_Path); j#29L"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l/SbJrM*  
 //}}AFX_DATA_MAP ^hU7QxW  
} v=!]t=P)t  
$cjidBi`):  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]2?t $"G8  
//{{AFX_MSG_MAP(CCaptureDlg) +g(QF   
 ON_WM_SYSCOMMAND() %|UCs8EFm  
 ON_WM_PAINT() *f1MgP*GKF  
 ON_WM_QUERYDRAGICON() XJ.vj+XXb  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4jvgyi 9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [^#6.xH  
 ON_BN_CLICKED(ID_CHANGE, OnChange) A%pcPzG;  
//}}AFX_MSG_MAP /aP`|&G,)  
END_MESSAGE_MAP() 7Y:1ji0l  
d&F8nBIM5  
BOOL CCaptureDlg::OnInitDialog()  IG 6yt  
{ (,[Oy6o  
 CDialog::OnInitDialog(); M*|x,K=U  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); b3W@{je  
 ASSERT(IDM_ABOUTBOX < 0xF000); c{z QX0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $`mxOcBmQ  
 if (pSysMenu != NULL) =}F &jl  
 { ,'[0tl}8K  
  CString strAboutMenu; 0X.pI1jCO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); SO9j/  
  if (!strAboutMenu.IsEmpty()) c5pF?kFaD  
  { &;|/I`+  
   pSysMenu->AppendMenu(MF_SEPARATOR); ml\A)8O]j/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }!x\qpA  
  } A?=g!(wB  
 } Z%k)'%_   
 SetIcon(m_hIcon, TRUE); // Set big icon $o0o5 ^Z-  
 SetIcon(m_hIcon, FALSE); // Set small icon fM6Pw6k  
 m_Key.SetCurSel(0); Ap=L lZ  
 RegisterHotkey(); 6|L<? X  
 CMenu* pMenu=GetSystemMenu(FALSE); 5?{a=r9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); voEg[Gg4%I  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xh,};TS(K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s7[du_)  
 return TRUE; // return TRUE unless you set the focus to a control IZ/+ROn  
} |#>\GU=!  
WL:CBE#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) > X<pzD3u  
{ z1K@AaRx  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 2Gd.B/L6  
 { (]>= y  
  CAboutDlg dlgAbout; )l~:P uvh  
  dlgAbout.DoModal(); &]iiBp#2  
 }  \9N1:  
 else =Q>'?w>  
 { {1Z8cV   
  CDialog::OnSysCommand(nID, lParam); UiO%y  
 } (R5n ND  
} J'jwRn  
e0Zwhz,  
void CCaptureDlg::OnPaint() G(" S6u  
{ V.?N29CA|  
 if (IsIconic()) ..'k+0u^  
 { yPs4S?<s  
  CPaintDC dc(this); // device context for painting CY"&@v1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j51Wod<[  
  // Center icon in client rectangle *:L-/Q)i  
  int cxIcon = GetSystemMetrics(SM_CXICON); I?r7dQEm  
  int cyIcon = GetSystemMetrics(SM_CYICON); o`,|{K$H  
  CRect rect; ra2sYH1wr  
  GetClientRect(&rect); 9$U@h7|Q`  
  int x = (rect.Width() - cxIcon + 1) / 2; %&w 8E[  
  int y = (rect.Height() - cyIcon + 1) / 2; Z<jio  
  // Draw the icon M$iDaEu-  
  dc.DrawIcon(x, y, m_hIcon); B)>r~v]  
 } 8` ~M$5!  
 else vkUXMMuf+e  
 { 1$mxMXNsJ  
  CDialog::OnPaint(); )lh48Ag0t;  
 } q% *-4GP  
} #e)A  
nE;^xMOK!  
HCURSOR CCaptureDlg::OnQueryDragIcon() IdTa tE|^  
{ 4j+FDc`  
 return (HCURSOR) m_hIcon; 0se0AcrW  
} @/jLN  
4 JC*c  
void CCaptureDlg::OnCancel() 3*INDD=  
{ b/;!yOF  
 if(bTray) f"i(+:la  
  DeleteIcon(); g2)jd[GM  
  CDialog::OnCancel(); "  ,k(*  
} TNun)0p  
IY_u|7d  
void CCaptureDlg::OnAbout() dZ^(e0& :H  
{ Y%$@ZYW  
 CAboutDlg dlg; B"KDr_,,  
 dlg.DoModal(); b~$B 0o)  
} $FR1^|P/G  
X~+AaI :~K  
void CCaptureDlg::OnBrowse() ,zXP,(x  
{ ,yPs4',d  
 CString str; TgC8EcLr  
 BROWSEINFO bi; 5~8FZ-x  
 char name[MAX_PATH]; w2 %u;D%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); i*ibx;s-  
 bi.hwndOwner=GetSafeHwnd(); -!_\4  
 bi.pszDisplayName=name; o}^/K m+t  
 bi.lpszTitle="Select folder"; n{Ce%gy  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %3SBs*?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [te9ui%JS  
 if(idl==NULL) 0 $Ygt0d  
  return; ^v2-"mX<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^lw0} i  
 str.ReleaseBuffer(); (g(.gN]  
 m_Path=str; I7=g8/JD  
 if(str.GetAt(str.GetLength()-1)!='\\') 7tZvz `\  
  m_Path+="\\"; [-Xz:  
 UpdateData(FALSE); :2v^pg|  
} nf%"7y{dd  
#k}x} rn<'  
void CCaptureDlg::SaveBmp() cpY'::5.%  
{ g#W/WKvM  
 CDC dc; Wnf3[fV6P  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  iwiHw  
 CBitmap bm; -9D2aY_>  
 int Width=GetSystemMetrics(SM_CXSCREEN); nO;*Peob  
 int Height=GetSystemMetrics(SM_CYSCREEN); O4c[,Uq8~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 44r@8HO1  
 CDC tdc; #saK8; tp  
 tdc.CreateCompatibleDC(&dc); LA +BH_t&  
 CBitmap*pOld=tdc.SelectObject(&bm); --D&a;CO}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); An.Qi=Cv  
 tdc.SelectObject(pOld); s8O.yL  
 BITMAP btm; n PAl8  
 bm.GetBitmap(&btm); Gl!fT1zh0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; <]w(1{q(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 4hQ.RO  
 BITMAPINFOHEADER bih; [\_#n5  
 bih.biBitCount=btm.bmBitsPixel; '!V5 #J  
 bih.biClrImportant=0; nuvRjd^N  
 bih.biClrUsed=0; ?=^~(x?S  
 bih.biCompression=0; DTx!# [  
 bih.biHeight=btm.bmHeight; (9!/bX<  
 bih.biPlanes=1; ezz;NH  
 bih.biSize=sizeof(BITMAPINFOHEADER); wO-](3A-8P  
 bih.biSizeImage=size; \gU=B|W  
 bih.biWidth=btm.bmWidth;  sJ3O ]  
 bih.biXPelsPerMeter=0; G=VbEL^H  
 bih.biYPelsPerMeter=0; DQ08dP((v  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); HxE`"/~.7k  
 static int filecount=0; Id(wY$C&>  
 CString name; !dcG Bj  
 name.Format("pict%04d.bmp",filecount++); :c?}~a~JO(  
 name=m_Path+name; dv7IHUFf  
 BITMAPFILEHEADER bfh; L/+KY_b:*  
 bfh.bfReserved1=bfh.bfReserved2=0; S&q(PI_"  
 bfh.bfType=((WORD)('M'<< 8)|'B'); s{Wj&.)M  
 bfh.bfSize=54+size; )ZHo7X  
 bfh.bfOffBits=54; d*cAm$  
 CFile bf; 'F .tOD  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pD@2Mt0|]=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  f3E%0cg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); n !oxwA!  
  bf.WriteHuge(lpData,size); #P,C9OQD  
  bf.Close(); #"PRsMUw  
  nCount++; ,Oj 53w=  
 }  "d3qUk  
 GlobalFreePtr(lpData); jmkVolz  
 if(nCount==1) I_aS C4  
  m_Number.Format("%d picture captured.",nCount); sM  _m  
 else C)H1<Br7  
  m_Number.Format("%d pictures captured.",nCount); Z\ 1wEGP7{  
  UpdateData(FALSE); *z3wm-z1&  
} =X24C'!Mpe  
bdBFDg  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _?m%i]~o  
{ naaww  
 if(pMsg -> message == WM_KEYDOWN) ]A.tauSW  
 { m|8ljXX  
  if(pMsg -> wParam == VK_ESCAPE) ]!mC5Ea  
   return TRUE; O9/7?"l"  
  if(pMsg -> wParam == VK_RETURN) qiyX{J7Z  
   return TRUE; I5$]{:L|9  
 } O\z]1`i*o  
 return CDialog::PreTranslateMessage(pMsg); 3B^`xnV  
} i| /EA7  
?*K{1Ghf  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EWZ?q$  
{ 24; BY'   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ h+"UK=  
  SaveBmp(); /t $J<bU  
  return FALSE; up^D9(y\  
} id=:J7!QU  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pI]tv@>:f  
 CMenu pop; i^I U)\   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6 h%%?  
 CMenu*pMenu=pop.GetSubMenu(0); A])+Pe  
 pMenu->SetDefaultItem(ID_EXITICON); ]A]EED.ZH  
 CPoint pt; g UAx8=h  
 GetCursorPos(&pt); O&vE 5%x  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {g@?\  
 if(id==ID_EXITICON) &40# _>W7  
  DeleteIcon(); r,FPTf  
 else if(id==ID_EXIT) ji] H|  
  OnCancel(); na)-'  
 return FALSE; :Y\!~J3W  
} O dWZYWj  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 5p]Cwj<u  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9irT}e  
 AddIcon(); NJqjW  
 return res; )B1gX>J\8  
} /ZpwJc`e  
+jifbf-  
void CCaptureDlg::AddIcon() m&&Y=2  
{ (h $[g"8  
 NOTIFYICONDATA data; s ~ Xa=_+D  
 data.cbSize=sizeof(NOTIFYICONDATA); $bd tiD  
 CString tip; O3];1ud  
 tip.LoadString(IDS_ICONTIP); NB@TyU  
 data.hIcon=GetIcon(0); hP$v,"$  
 data.hWnd=GetSafeHwnd(); L';b908r2  
 strcpy(data.szTip,tip); -l2aAK1M  
 data.uCallbackMessage=IDM_SHELL; 'Io2",~ M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *F)+- BB  
 data.uID=98; SAUfA5|e  
 Shell_NotifyIcon(NIM_ADD,&data); a"Q>K7K  
 ShowWindow(SW_HIDE); %X^K5Io  
 bTray=TRUE; QswbIP/>:'  
} /jB 0  
C A 8N  
void CCaptureDlg::DeleteIcon() >v9@p7Dn  
{ m_;<7W&p]  
 NOTIFYICONDATA data;  !L|PDGD  
 data.cbSize=sizeof(NOTIFYICONDATA); ]\ DIJ>JZ  
 data.hWnd=GetSafeHwnd(); }]K^b1Fs5  
 data.uID=98; Ku3/xcu:My  
 Shell_NotifyIcon(NIM_DELETE,&data); -Rcl(Q}LZ  
 ShowWindow(SW_SHOW); Q}(D^rGP3  
 SetForegroundWindow(); 8F(Vd99I  
 ShowWindow(SW_SHOWNORMAL); FcI ZG _  
 bTray=FALSE; ~V`F5B  
} ?K9zTas@  
fHc/5uYW  
void CCaptureDlg::OnChange() .CY;-  
{ .R! /?eN  
 RegisterHotkey(); J\fu6Ti  
} |tua*zEsS  
1O@y >cV  
BOOL CCaptureDlg::RegisterHotkey() |on$ )vm  
{ x+;"(]#  
 UpdateData(); l<"Z?z  
 UCHAR mask=0; YVT\@+C'  
 UCHAR key=0; K2gg"#ft?  
 if(m_bControl) Ph Ep3o&"  
  mask|=4; 2J0N]`|)  
 if(m_bAlt) xmp^`^v*  
  mask|=2; oD?c]}3  
 if(m_bShift) iLR^V!  
  mask|=1; ! {c"C  
  key=Key_Table[m_Key.GetCurSel()]; s^6"qhTa  
 if(bRegistered){ *\4u:1Cu  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ){S/h<4m  
  bRegistered=FALSE; b$O1I[o  
 } GDBxciv  
 cMask=mask; gPYF2m  
 cKey=key; 6O9?":3;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >|| =#;  
 return bRegistered; }p$@.+  
} ![}q9aeT  
W^sH|2g  
  四、小结 Uc>$w?oA  
#lo1GoL\  
  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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