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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: `d,v  
  W{El^')F  
  一、实现方法 ^Rpy5/d  
4uX|2nJ2!;  
  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: 8\lRP,-  
mJ #|~I*Z-  
#pragma data_seg("shareddata") z+5ZUS2~&  
HHOOK hHook =NULL; //钩子句柄 `)aIFAW  
UINT nHookCount =0; //挂接的程序数目 mm1fG4 *%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 xs}3=&c(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _o+z#Fnz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey M+|J;caX  
static int KeyCount =0; hf`5NcnP  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 VG=mA4Dd  
#pragma data_seg()  /N8>>g  
.#OD=wkN0  
  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。 2 -C*RHRx  
I$y6N"|  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: QjIn0MJ)Xm  
@CB&*VoB  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r3}Q1b&  
cKey,UCHAR cMask) 2{Johqf  
{ *x<3=9V  
 BOOL bAdded=FALSE; ?cB:1?\j  
 for(int index=0;index<MAX_KEY;index++){ rlpbLOG`  
  if(hCallWnd[index]==0){ \/8oua_)  
   hCallWnd[index]=hWnd; m~f J_  
   HotKey[index]=cKey; m>:zwz< ;  
   HotKeyMask[index]=cMask; SDbR(oV  
   bAdded=TRUE; Ovhd%qV;Y  
   KeyCount++; yQ03&{#  
   break; 2uEvu  
  } Lu.C+zgQ  
 } @ L=dcO{r  
 return bAdded; K2o\+t  
} k|r|*|8  
//删除热键 /QW-#K|S&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9j8<Fs0M  
{ q}+Fm?B   
 BOOL bRemoved=FALSE; a W9_[#z5  
 for(int index=0;index<MAX_KEY;index++){ nYb{?{_ca8  
  if(hCallWnd[index]==hWnd){ e h6\y7 9g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ v1`*}.#  
    hCallWnd[index]=NULL; n85d g  
    HotKey[index]=0; JFOXrRR=d  
    HotKeyMask[index]=0; bm\Zp  
    bRemoved=TRUE; DX b=Ku  
    KeyCount--; +M{A4nYY|1  
    break; }~O`(mnD}K  
   } \2^_v' >K  
  } ;%<R>gDWv  
 } cYx.<b JH  
 return bRemoved; 0_f6Qrcj  
}  N3m~nEj  
"Nh}_jO  
j&|>Aa${  
  DLL中的钩子函数如下: Z1Pdnc7S[  
*p.70,5,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JW2~ G!@  
{ ]w5j?h"b  
 BOOL bProcessed=FALSE; _qp^+  
 if(HC_ACTION==nCode) VSDG_:!K  
 { JBMJR  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,&ld:v?~  
   switch(wParam) rk)h_zN  
   {  8r\;8all  
    case VK_MENU: Y7GHIzX  
     MaskBits&=~ALTBIT; @\?QZX(H  
     break; 9k*1_  
    case VK_CONTROL: Mrly(*!U"@  
     MaskBits&=~CTRLBIT; sIz*r Gz  
     break; E5.@=U,c  
    case VK_SHIFT: tg"NWp6  
     MaskBits&=~SHIFTBIT; G|+naZ  
     break; yk0#byW`  
    default: //judge the key and send message SLjSNuOP  
     break; (> VD#n  
   } 5tUN'KEbN  
   for(int index=0;index<MAX_KEY;index++){ ,xOOR   
    if(hCallWnd[index]==NULL) HlgkW&}c^  
     continue; caD|*.b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~ \3j{pr  
    { nJr:U2d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :p0<AU47  
     bProcessed=TRUE; @w @SOzS)  
    } %<rV~9:  
   } %^LwLyoVM  
  } w(cl,W/w  
  else if((lParam&0xc000ffff)==1){ //有键按下 cz.,QIt_  
   switch(wParam) NA{?DSP  
   { >!BZ>G2  
    case VK_MENU: P~9y}7Q\0  
     MaskBits|=ALTBIT; i"GCm`  
     break; 9*CJWS;  
    case VK_CONTROL: yr[HuwU  
     MaskBits|=CTRLBIT; 3aERfIJyE  
     break; C|g]Y 7  
    case VK_SHIFT: )mh,F# "L  
     MaskBits|=SHIFTBIT; Nu4PY@m]C  
     break; ]S0sjN  
    default: //judge the key and send message 3v,Bg4[i  
     break; )ad6>Y  
   } T(q/$p&q  
   for(int index=0;index<MAX_KEY;index++){ w#w?Y!JXo  
    if(hCallWnd[index]==NULL) ?3; 0 SAh  
     continue; x~n]r[!L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e;r?g67  
    { D&/~lhyNZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4&_|myO&  
     bProcessed=TRUE; X{-901J1  
    } 4VI'd|Ed  
   } *'\ xlsp#  
  } =2R0 g2n  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ",>,t_J  
   for(int index=0;index<MAX_KEY;index++){ jlb=]hp8%  
    if(hCallWnd[index]==NULL) 2|:x_rcj  
     continue; K['Gp>l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oBI@.&tG}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GSaU:A  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g?> V4WF  
   } T@gm0igW/;  
  }  Jknit  
 } bc%N !d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c?7 Wjy  
} 2/f!{lz](  
HE.YfD)  
  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: 5"^Z7+6  
z8*{i]j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4u+4LB*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uK5 C-  
E0_S+`o2y  
  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: i564<1`x  
mb#&yK(h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *jrQ-'<T  
{ +GFK!Pf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3.@ I\p}  
 { :Lh`Q"a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ' "I-! +  
  SaveBmp(); nf )y_5y  
  return FALSE; S0jYk (  
 } qN@0k>11?  
 …… //其它处理及默认处理 p{W'[A{J .  
} `HV~.C  
#8sv*8&  
MwO`DrV  
  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。 DQyy">]Mh  
 mm9xO%  
  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。 L/7YI\C2  
1# ;`1i  
  二、编程步骤 a@s@E  
^7,`6g  
  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"; {qbx iL-  
jQ&82X%m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Msl8o c  
tEjT$`6hp  
  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; G{4lgkyy  
p?e-`xs  
  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; 7J[s5'~|  
HqoCl  
  5、 添加代码,编译运行程序。 k\A[p\  
vR?E'K3  
三、程序代码 ew 4pAav  
RC+`sZ E9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL O~&j}WN  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1qd(3A41  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ .$N8cYu0  
#if _MSC_VER > 1000 R~H+.Vh  
#pragma once A`ScAzx5{  
#endif // _MSC_VER > 1000 sQgJ`+Y8_  
#ifndef __AFXWIN_H__ H0?Vq8I?  
#error include 'stdafx.h' before including this file for PCH idSc#n22  
#endif yYn7y1B  
#include "resource.h" // main symbols SeIL   
class CHookApp : public CWinApp Zg/ ],/`  
{ xF])NZy|  
 public: '/ *;g#W=  
  CHookApp(); K~Z$NS^W&  
  // Overrides @@} ]qT*  
  // ClassWizard generated virtual function overrides vd#BT$d?  
  //{{AFX_VIRTUAL(CHookApp) ,pR.HCR#Y  
 public: }-2U,Xg[  
  virtual BOOL InitInstance(); ql(~3/kA_  
  virtual int ExitInstance(); r l>e~i  
  //}}AFX_VIRTUAL u]jvXPE6  
  //{{AFX_MSG(CHookApp) DA9f\q   
  // NOTE - the ClassWizard will add and remove member functions here. Ys+NIV#Q  
  // DO NOT EDIT what you see in these blocks of generated code ! :BpXi|n;  
  //}}AFX_MSG 4StoEgFS  
  DECLARE_MESSAGE_MAP() N`rz>6,k1  
}; !X ={a{<,T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hd~0qK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uE-|]QQo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h$$2(!G4  
BOOL InitHotkey(); "s.s(TR8  
BOOL UnInit(); S- JD}+ 9  
#endif !1[ZfTX^a  
]y~"M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9Z lfY1=  
#include "stdafx.h" 0+6=ag%  
#include "hook.h" \CVrLn;}  
#include <windowsx.h> 4v;KtD;M  
#ifdef _DEBUG 0^mCj<g  
#define new DEBUG_NEW KSxZ4Y  
#undef THIS_FILE `=19iAp.  
static char THIS_FILE[] = __FILE__; OXD*ZKi8  
#endif ?eOw8Rom  
#define MAX_KEY 100 Y20T$5{#  
#define CTRLBIT 0x04 z(Q 5?+P  
#define ALTBIT 0x02 t 4>\ ;  
#define SHIFTBIT 0x01 $n_ax\15  
#pragma data_seg("shareddata") ~w"e 2a  
HHOOK hHook =NULL; \fJ _,  
UINT nHookCount =0; mV#U=zqb!S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~en'E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,)Z1&J?  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey DQ hstXX  
static int KeyCount =0; !MEA@^$#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift V*H7m'za  
#pragma data_seg() CMC9%uq  
HINSTANCE hins; tqzr +  
void VerifyWindow(); g-DFcwO,V  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r;SOAucX  
//{{AFX_MSG_MAP(CHookApp) rH9[x8e  
// NOTE - the ClassWizard will add and remove mapping macros here. |DLmMsS4  
// DO NOT EDIT what you see in these blocks of generated code! Q&8epO|J  
//}}AFX_MSG_MAP }E#1Z\)  
END_MESSAGE_MAP() w 3$9  
> 8%O;3-m#  
CHookApp::CHookApp() e~PAi8B5  
{ As>P(  
 // TODO: add construction code here, Lv7$@|"H9  
 // Place all significant initialization in InitInstance z@U5  
} .wf$]oQQ  
#D .hZ=!  
CHookApp theApp; r Fhi:uRV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]:svR@E  
{ 2k+u_tj>  
 BOOL bProcessed=FALSE; H-t"Z}  
 if(HC_ACTION==nCode) ];*? `}#  
 { !XQ)>T^G5  
  if((lParam&0xc0000000)==0xc0000000){// Key up ub]"b[j\1  
   switch(wParam) ]. 0;;v6)  
   { <8BNqbX  
    case VK_MENU: PZk"!I<oN  
     MaskBits&=~ALTBIT;  J7p?9  
     break; \T {<{<n  
    case VK_CONTROL: fF.sT7Az+  
     MaskBits&=~CTRLBIT; 1;JH0~403  
     break; jPEOp#C  
    case VK_SHIFT: t(Gg 1  
     MaskBits&=~SHIFTBIT; {~EPP .  
     break; _:+ k|I  
    default: //judge the key and send message 7uq^TO>9f  
     break; i Ie{L-Na  
   } @6%o0p9zz  
   for(int index=0;index<MAX_KEY;index++){ }ZJ*N Y  
    if(hCallWnd[index]==NULL) l(d3N4iz  
     continue; ='Yg^:n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zR5KC!xc  
    { u1ahAk7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]}L tf,9  
     bProcessed=TRUE; }Apn.DYbbf  
    } (lt{$0   
   } 4rUOk"li  
  } -;iCe7|Twf  
  else if((lParam&0xc000ffff)==1){ //Key down e@{Rlz   
   switch(wParam) Aaz2._:/-m  
   { ,tak{["  
    case VK_MENU: 3]h*6 V1$  
     MaskBits|=ALTBIT; LN`Y`G|op  
     break; w]O,xO  
    case VK_CONTROL: d$:LUxM#  
     MaskBits|=CTRLBIT; >\[|c  
     break; }X~"RQf9  
    case VK_SHIFT: 3u[5T|D'  
     MaskBits|=SHIFTBIT; M=Y['w x  
     break; "mc ]^ O  
    default: //judge the key and send message <jG[ z69)  
     break; q,>4#J[2;s  
   } h_15"rd  
   for(int index=0;index<MAX_KEY;index++) YR u#JYti  
   { Lmw4  
    if(hCallWnd[index]==NULL) \e~5Dx1  
     continue; ^y[- e9O|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <aQ5chf7  
    { ^J)0i_RS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d[oHjWk  
     bProcessed=TRUE; wicW9^ik  
    } q_Z6s5O  
   } xc,Wm/[  
  } xM![  
  if(!bProcessed){ #Ve@D@d[  
   for(int index=0;index<MAX_KEY;index++){ z@v2t>@3k  
    if(hCallWnd[index]==NULL) >DR$}{IV  
     continue; r0q?e`nsA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #@J{ )  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (e4 #9  
   } gjk;An  
  } 5 Q/yPQN  
 } \i3)/sZ?l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !Y10UmMu  
} >1$Vh=\OI  
R p0^Gwa  
BOOL InitHotkey() w9675D+  
{ DA>TT~L  
 if(hHook!=NULL){ }WHq?  
  nHookCount++; Q^):tO]!Ma  
  return TRUE; Mk}*ze0%  
 } (Ta(Y=!uq  
 else !,R=6b$E5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i5SDy(?r  
  if(hHook!=NULL) "-S@R=bi  
   nHookCount++; LIn2&r:U  
  return (hHook!=NULL);  %e(DPX  
} ~l]g4iEp  
BOOL UnInit() u}89v1._Jn  
{ TQth"Cv2:  
 if(nHookCount>1){ f$qkb$?]}  
  nHookCount--; (wf3HEb_  
  return TRUE; ._q<~_~R  
 } ~ 1~|/WG  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ZE9.r`  
 if(unhooked==TRUE){ QW_BT ^d"  
  nHookCount=0; "[0.a\ d<  
  hHook=NULL; #I\" 'n5M  
 } KxDp+]N]  
 return unhooked; Ey% KbvNv  
} nPk&/H%5hn  
y-{?0mLq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &0]5zQ  
{ 6FY.kN\  
 BOOL bAdded=FALSE; @hy~H?XN  
 for(int index=0;index<MAX_KEY;index++){ LCW}1H:Q  
  if(hCallWnd[index]==0){ Nh\o39=  
   hCallWnd[index]=hWnd; dSe d 6  
   HotKey[index]=cKey; [S9"' ^H  
   HotKeyMask[index]=cMask; TX;)}\  
   bAdded=TRUE; b@O{eQB  
   KeyCount++; y9.?5#aL  
   break; r1 b"ta  
  } !+]KxB   
 } -A zOujSS  
 return bAdded; *K BaKS  
} GJ F &id  
4W}mPeEeV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kK/XYC 0D  
{ ^?*<.rsG  
 BOOL bRemoved=FALSE; Wb[k2V  
 for(int index=0;index<MAX_KEY;index++){ v]Aop<KLX  
  if(hCallWnd[index]==hWnd){ v0?SN>fZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `3`.usw  
    hCallWnd[index]=NULL; RC?vU  
    HotKey[index]=0; `jVRabZ0  
    HotKeyMask[index]=0; <@Vf:`a!P>  
    bRemoved=TRUE; ,RW`9+gx  
    KeyCount--; =- ,'LOE  
    break; ci/qm\JI<<  
   } O<E8,MCA[a  
  } u:mndTpB6x  
 } /nn~&OU  
 return bRemoved; \+=`o .2  
} IUNr<w<  
Io[NN aF|  
void VerifyWindow() fI1 9p Q  
{ [P6m8%Y|s  
 for(int i=0;i<MAX_KEY;i++){ 0a bQY  
  if(hCallWnd!=NULL){ i,S1|R  
   if(!IsWindow(hCallWnd)){ crN*eFeW  
    hCallWnd=NULL; BC\W`K  
    HotKey=0; r-yUWIr S  
    HotKeyMask=0; `oH4"9&]k3  
    KeyCount--; w`=O '0d  
   } <XQwu*_\  
  } o8|qT)O@U  
 } ?5/7 @V  
} r7L.W  
/'5d0' ,M  
BOOL CHookApp::InitInstance() ?c+$9  
{ V)l:fUm2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Dh}(B$~Oz+  
 hins=AfxGetInstanceHandle(); a(=lQ(v/?  
 InitHotkey(); {dm>]@"S  
 return CWinApp::InitInstance(); )RT?/NW  
} kkWv#,qwU  
zBu@a:E%H  
int CHookApp::ExitInstance() &pjj  
{ YB<nz<;JR  
 VerifyWindow(); J7^ UQ  
 UnInit(); )Jdku}Pf  
 return CWinApp::ExitInstance(); wDGb h=  
} >TY;l3ew  
x^EW'-a  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GBT|1c'i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p)ig~kk`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {-8Nq`w  
#if _MSC_VER > 1000 ;{L[1OP%e  
#pragma once elQjPvb  
#endif // _MSC_VER > 1000 h`dQ OH#  
BAY e:0  
class CCaptureDlg : public CDialog M<d!j I9)  
{ xPPA8~Dm*  
 // Construction )#cZ& O  
 public: 6lv@4R^u  
  BOOL bTray; {sGEopd8]q  
  BOOL bRegistered; ..X_nF  
  BOOL RegisterHotkey(); -Dx3*ZhP  
  UCHAR cKey; Yj/ o17  
  UCHAR cMask; 6]~/`6Dub  
  void DeleteIcon(); DXI4DM"15I  
  void AddIcon(); 8FMxn{k2  
  UINT nCount; EJ#I7_  
  void SaveBmp(); q,O_y<uw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4\u`M R  
  // Dialog Data yn_f%^!G  
  //{{AFX_DATA(CCaptureDlg) -0#"<!N  
  enum { IDD = IDD_CAPTURE_DIALOG }; z!O;s ep?/  
  CComboBox m_Key; 6V%}2YE?X  
  BOOL m_bControl; vt2. i$u  
  BOOL m_bAlt; G<D8a2q  
  BOOL m_bShift; hTzj{}w  
  CString m_Path; R[j?\#  
  CString m_Number; Z4Dx:m-  
  //}}AFX_DATA &K[sb%  
  // ClassWizard generated virtual function overrides *$BUow/>  
  //{{AFX_VIRTUAL(CCaptureDlg) [n)ak)_/  
 public: cx$h"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *X/Vt$P  
 protected: GEF's#YWK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j?m(l,YD|*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yRyXlZC  
  //}}AFX_VIRTUAL grzmW4Cw  
  // Implementation <)wLxWalF  
 protected: QK[^G6TI  
  HICON m_hIcon; \}v@!PQl  
  // Generated message map functions @jm+TW  
  //{{AFX_MSG(CCaptureDlg) @n?"*B  
  virtual BOOL OnInitDialog(); &qG/\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); KR?aL:RYb  
  afx_msg void OnPaint(); ;mQ|+|F6X  
  afx_msg HCURSOR OnQueryDragIcon(); * 3fl}l  
  virtual void OnCancel(); B qX"La,  
  afx_msg void OnAbout(); I3Z?xsa@Z  
  afx_msg void OnBrowse(); 5z,q~CU  
  afx_msg void OnChange(); %%}l[W  
 //}}AFX_MSG Os'E7;:1h  
 DECLARE_MESSAGE_MAP() //BJaWq  
}; [|oG}'Xz  
#endif 1C{0 R.  
C/Tk`C&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N=Ct3  
#include "stdafx.h" `e<IO_cg  
#include "Capture.h" 9dNkKMc@  
#include "CaptureDlg.h" SNOc1c<~  
#include <windowsx.h> rIPfO'T?  
#pragma comment(lib,"hook.lib") YiO}"  
#ifdef _DEBUG '1LN)Yw  
#define new DEBUG_NEW wg%Z  
#undef THIS_FILE ^UJIDg7zS  
static char THIS_FILE[] = __FILE__; xOKJOl  
#endif Z9$pY=8^?  
#define IDM_SHELL WM_USER+1 @2hhBW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W9Azp8)p]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lf>d{zd5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9e K~g0m  
class CAboutDlg : public CDialog aOGoJCt C  
{ p-{ 4 $W  
 public: d9:I.SA)E  
  CAboutDlg(); dY&v(~&;]  
  // Dialog Data #~nXAs]Q  
  //{{AFX_DATA(CAboutDlg) y/Y}C.IWp)  
  enum { IDD = IDD_ABOUTBOX }; \Hrcf+`  
  //}}AFX_DATA Y GOkqI  
  // ClassWizard generated virtual function overrides *sU,waX  
  //{{AFX_VIRTUAL(CAboutDlg) W7WHDL^  
 protected: \99'#]\_/E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !7I07~&1  
  //}}AFX_VIRTUAL "[~yu* S  
  // Implementation ]sb?lAxh{  
 protected: 36(qe"s  
  //{{AFX_MSG(CAboutDlg) en'[_43  
  //}}AFX_MSG &?bsBqpN  
  DECLARE_MESSAGE_MAP() ~/K&=xE  
}; NzyEsZ]$  
ai$l7]7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pP":,8Q{  
{ ^g6v#]&WA  
 //{{AFX_DATA_INIT(CAboutDlg) aSIb0`(3  
 //}}AFX_DATA_INIT `oikSx$vB.  
} =t-Ud^3  
!9 kNL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |OF3O,5z  
{ #oTVfY#  
 CDialog::DoDataExchange(pDX); "KK}} $>  
 //{{AFX_DATA_MAP(CAboutDlg) ,H"}Rw  
 //}}AFX_DATA_MAP 1q!k#Cliu  
} 1$03:ve1  
J' P:SC1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) k 6[   
 //{{AFX_MSG_MAP(CAboutDlg) eK1l~W%  
 // No message handlers d^RcJ3w  
 //}}AFX_MSG_MAP HN NeH;L  
END_MESSAGE_MAP() ? bWc<]  
k8}fKVU;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ASoBa&vX  
: CDialog(CCaptureDlg::IDD, pParent) p1niS:}j  
{ e_epuki  
 //{{AFX_DATA_INIT(CCaptureDlg) ZrEou}z(*  
  m_bControl = FALSE; 02;'"EmP$  
  m_bAlt = FALSE; YX,;z/Jw2  
  m_bShift = FALSE; seK;TQ3/7  
  m_Path = _T("c:\\"); ,^c-}`!K  
  m_Number = _T("0 picture captured."); V=+|]`  
  nCount=0; ,)xtl`fc  
  bRegistered=FALSE; Ne|CWUhO  
  bTray=FALSE; $!9U\Au>2  
 //}}AFX_DATA_INIT A}9^,C$#  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 3l~7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 1YMi4.  
} =p[Sd*d  
nw/g[/<;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Zc_F"KJL  
{ 6/wC StZ  
 CDialog::DoDataExchange(pDX); oe^JDb#  
 //{{AFX_DATA_MAP(CCaptureDlg) n Yx[9HN  
  DDX_Control(pDX, IDC_KEY, m_Key); `Z>=5:+G@2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); F%y#)53g  
  DDX_Check(pDX, IDC_ALT, m_bAlt); :* |WE29U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =3'B$PY  
  DDX_Text(pDX, IDC_PATH, m_Path); TxQsi"0c  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wS|k3^OV%  
 //}}AFX_DATA_MAP ],!}&#|  
} vqT) =ZC1  
cLL2 '  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h#UPU7;  
//{{AFX_MSG_MAP(CCaptureDlg) Z<d=v3q  
 ON_WM_SYSCOMMAND() \\ R<HuTY  
 ON_WM_PAINT() {f4jE#a>v  
 ON_WM_QUERYDRAGICON() 8~,zv_Pl  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4>d]0=x  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8u)>o* :  
 ON_BN_CLICKED(ID_CHANGE, OnChange) k8n9zJ8  
//}}AFX_MSG_MAP ECL{`m(#n  
END_MESSAGE_MAP() '@KH@~OzRS  
B=W#eu <1  
BOOL CCaptureDlg::OnInitDialog() 3'L =S  
{ :dipk,b?n  
 CDialog::OnInitDialog(); mm#UaEp  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |4/rVj"  
 ASSERT(IDM_ABOUTBOX < 0xF000);  rwSR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 3<)][<Ud  
 if (pSysMenu != NULL) (bI/s'?K  
 { w8q 2f-K-  
  CString strAboutMenu; F# 9^RA)9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZGh6- /  
  if (!strAboutMenu.IsEmpty()) ;>ml@@Z  
  { b (H J|  
   pSysMenu->AppendMenu(MF_SEPARATOR); %?V~7tHm>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _M8'~$Sg  
  } EVqqOp1$v4  
 } au=@]n#<(  
 SetIcon(m_hIcon, TRUE); // Set big icon W^HE1Dt]  
 SetIcon(m_hIcon, FALSE); // Set small icon 6X'0 T}  
 m_Key.SetCurSel(0); 7fWZ/;p  
 RegisterHotkey(); 8H};pu2  
 CMenu* pMenu=GetSystemMenu(FALSE); e:MbMj6`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); % mPv1$FH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'e<8j  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); FU*q9s`  
 return TRUE; // return TRUE unless you set the focus to a control fS'` 9  
} \ 6taC  
{l/`m.Z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1jzu-s ,F  
{ G 9 &,`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cna%;f.  
 { M).CyY;bm  
  CAboutDlg dlgAbout; Zr6.Nw  
  dlgAbout.DoModal(); g*_n|7pB  
 } }vP(SF 6  
 else O`_, _  
 { y~OP9Tg  
  CDialog::OnSysCommand(nID, lParam); mIrN~)C4\  
 } FnOa hLS  
} >U\P^yU  
]T5\LNyN  
void CCaptureDlg::OnPaint() |DsT $ ~D  
{ By[M|4a  
 if (IsIconic()) 5(1c?biP&  
 { :>ca).cjac  
  CPaintDC dc(this); // device context for painting b O}&i3.L;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k]-Q3 V  
  // Center icon in client rectangle ;c|_z 9+  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^XYK }J  
  int cyIcon = GetSystemMetrics(SM_CYICON); +>yh` Zb  
  CRect rect; "ig)7X+Wz|  
  GetClientRect(&rect); ~A%+oa*2~  
  int x = (rect.Width() - cxIcon + 1) / 2; ?c"i V  
  int y = (rect.Height() - cyIcon + 1) / 2; M|@@ LJ'  
  // Draw the icon ] NW_oRH  
  dc.DrawIcon(x, y, m_hIcon); Hv' OO@z  
 } )B+zv,#q  
 else #_3ZF"[zq  
 { /`#JM  
  CDialog::OnPaint(); @Wm:Rz  
 } NTK9`#SA  
} =%I;Y& K  
-#4QY70H t  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3 Sf':N`u  
{ ;U a48pSv  
 return (HCURSOR) m_hIcon; ?Ec{%N%  
} 1x##b [LC  
/Wl8Jf7'  
void CCaptureDlg::OnCancel() rOYYZ)Qw  
{ hZo  f  
 if(bTray) 7#Fcn  
  DeleteIcon(); e=# D1  
  CDialog::OnCancel(); lc [)Ev  
} p,(W?.ZDN?  
c*R\fQd  
void CCaptureDlg::OnAbout() Ed-3-vJej6  
{ Ms3GvPsgv  
 CAboutDlg dlg; X4'!:&  
 dlg.DoModal(); W"t^t|H'~  
} j}J=ZLr/V"  
2zv:j7  
void CCaptureDlg::OnBrowse() |h/{ qpsu  
{ K0I.3| 6C  
 CString str; >s.y1Vg~C  
 BROWSEINFO bi; CZy3]O"qW  
 char name[MAX_PATH]; g{>0Pa 1?C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .Tw:Y,G  
 bi.hwndOwner=GetSafeHwnd(); V`c,U7[/  
 bi.pszDisplayName=name; Ut/%+r"s  
 bi.lpszTitle="Select folder"; r1=j$G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; b8%TwYp  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {od@S l  
 if(idl==NULL) QWt3KW8)  
  return; Azr|cKu]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ll#W:~  
 str.ReleaseBuffer(); rAqS;@]0  
 m_Path=str; QaA?UzB  
 if(str.GetAt(str.GetLength()-1)!='\\') 5xj8^W^G9  
  m_Path+="\\"; "So "oT1  
 UpdateData(FALSE); +RiI5.$=Z  
} $i!r> .Jo  
S$40nM  
void CCaptureDlg::SaveBmp() 7dE.\#6r  
{ ![I|hB  
 CDC dc; 2o1WXE %$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); H_| re  
 CBitmap bm; M*Q}^<E*  
 int Width=GetSystemMetrics(SM_CXSCREEN); $n47DW &  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z?&ZgaSz  
 bm.CreateCompatibleBitmap(&dc,Width,Height); /m^G 99N  
 CDC tdc; HvZSkq^  
 tdc.CreateCompatibleDC(&dc); |-cXb.M[  
 CBitmap*pOld=tdc.SelectObject(&bm); 1IT(5Mleb  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *<"{(sAvk  
 tdc.SelectObject(pOld); *p\fb7Pu_3  
 BITMAP btm; !4Sd^"  
 bm.GetBitmap(&btm); zITxJx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /Ah'KN|EN  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %z.d;[Hs  
 BITMAPINFOHEADER bih; DqmKD U  
 bih.biBitCount=btm.bmBitsPixel; P{J9#.Zq&s  
 bih.biClrImportant=0; 6V6Mo}QF s  
 bih.biClrUsed=0; +o0yx U 7t  
 bih.biCompression=0; qM2m!  
 bih.biHeight=btm.bmHeight; 5'`DrTOA  
 bih.biPlanes=1; PJ<qqA`!  
 bih.biSize=sizeof(BITMAPINFOHEADER); }1CvbB%,A  
 bih.biSizeImage=size; )1GJ^h$l  
 bih.biWidth=btm.bmWidth; !\Cu J5U  
 bih.biXPelsPerMeter=0; 0pH$Mk Q  
 bih.biYPelsPerMeter=0; @~5Fcfmm  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3rJ LLYR  
 static int filecount=0; MJH>rsTQ  
 CString name; ^Q+z^zlC  
 name.Format("pict%04d.bmp",filecount++); |942#rM  
 name=m_Path+name; Z0XQ|gkH  
 BITMAPFILEHEADER bfh; <y7Hy&&y-  
 bfh.bfReserved1=bfh.bfReserved2=0; -H|!KnR  
 bfh.bfType=((WORD)('M'<< 8)|'B'); YV>&v.x0;  
 bfh.bfSize=54+size; d@b2XCh<K  
 bfh.bfOffBits=54; eE;j#2SEO  
 CFile bf; VpY,@qh  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8b4? O"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 4N3O<)C)@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "&;X/~j  
  bf.WriteHuge(lpData,size); *M>~$h7  
  bf.Close(); w`M`F<_\:  
  nCount++; RjrQDh|((  
 } ip*^eS^  
 GlobalFreePtr(lpData); 4/ q BD  
 if(nCount==1) OCCC' k  
  m_Number.Format("%d picture captured.",nCount); ^'+#BPo9@  
 else %@ q2  
  m_Number.Format("%d pictures captured.",nCount); vkG%w;  
  UpdateData(FALSE); yWT1CID  
} vI48*&]wTf  
F/:%YR;  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ~xws5n}F  
{ 3.ShAL  
 if(pMsg -> message == WM_KEYDOWN) :DuEv:;v  
 { 6O0aGJ,H  
  if(pMsg -> wParam == VK_ESCAPE) ;l < amB  
   return TRUE; R'atg 9  
  if(pMsg -> wParam == VK_RETURN) G$CSZrP.  
   return TRUE; \-[ >bsg  
 } lKqFuLHwF  
 return CDialog::PreTranslateMessage(pMsg); 4 &:|h  1  
} =n@\m <  
W,!7_nl"u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) i!(5y>I_  
{ J?4dafkw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ CalW J  
  SaveBmp(); 28- z  
  return FALSE; I,]q;lEMt  
} :RBeq,QaO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  >Af0S;S  
 CMenu pop; Z;0<k;#T(p  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t9lf=+%s  
 CMenu*pMenu=pop.GetSubMenu(0); <1_3`t  
 pMenu->SetDefaultItem(ID_EXITICON); qn}VW0!  
 CPoint pt; iVmy|ewd  
 GetCursorPos(&pt); 8R(l~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); i;IhsKO0R  
 if(id==ID_EXITICON) Nm%#rZrN~Q  
  DeleteIcon(); Uw3wR!:  
 else if(id==ID_EXIT) |X6R 2I  
  OnCancel(); Rz*GRe  
 return FALSE; 6 lEv<)cC  
} vuJEPn%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); AOV{@ b(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _?I*:: I  
 AddIcon(); 34_ V&8  
 return res; 7lwFxP5QT  
} ) <w`:wD  
U5?QneK  
void CCaptureDlg::AddIcon() t23W=U  
{ ^L.'At  
 NOTIFYICONDATA data; cveQ6 -`K  
 data.cbSize=sizeof(NOTIFYICONDATA); ?k^m|Z  
 CString tip; :}gEt?TUhs  
 tip.LoadString(IDS_ICONTIP); )%8st'  
 data.hIcon=GetIcon(0); .O&YdUo  
 data.hWnd=GetSafeHwnd(); uy<b5.!-  
 strcpy(data.szTip,tip); G2P:|R  
 data.uCallbackMessage=IDM_SHELL; TDy$Mv=y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; t/3qD7L  
 data.uID=98; 0&tr3!h\  
 Shell_NotifyIcon(NIM_ADD,&data); yDRi  
 ShowWindow(SW_HIDE); ^B7Ls{  
 bTray=TRUE; =OTu8_ d0t  
} MvaX>n !o  
>m%7dU  
void CCaptureDlg::DeleteIcon() ETdN<}m  
{ :$P1ps3B  
 NOTIFYICONDATA data; d%E*P4Ua  
 data.cbSize=sizeof(NOTIFYICONDATA); GR 1%(,  
 data.hWnd=GetSafeHwnd(); Cyo:Da  A  
 data.uID=98; Y'+K U/H  
 Shell_NotifyIcon(NIM_DELETE,&data); x>T+k8[n  
 ShowWindow(SW_SHOW); i]qxF&1  
 SetForegroundWindow(); /o}i,i$  
 ShowWindow(SW_SHOWNORMAL); ^^a%Lz)U  
 bTray=FALSE; xjrL@LO#  
} 1/?K/gL  
rcH{"\F_/  
void CCaptureDlg::OnChange() 3`NSSS  
{ ?<Mx*l  
 RegisterHotkey(); nm %7e!{m  
} Re*~C:  
4 DV,f2:R4  
BOOL CCaptureDlg::RegisterHotkey() \,lIPA/L  
{ ;(K"w*  
 UpdateData(); ,<s:* k  
 UCHAR mask=0; aH_FBY  
 UCHAR key=0; k_gl$`A  
 if(m_bControl) >CHb;*U  
  mask|=4; T?tZ?!6  
 if(m_bAlt) la^K|!|  
  mask|=2; mDuS-2G=D  
 if(m_bShift) LE?sAN  
  mask|=1; [b~+VeP+p4  
  key=Key_Table[m_Key.GetCurSel()]; 8cURYg6v  
 if(bRegistered){ p$*P@qm  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~I~lb/  
  bRegistered=FALSE; F9A5}/\  
 } =&DuQvN,  
 cMask=mask; sJ5#T iX  
 cKey=key; %D% Ok7s})  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +NeoGnj  
 return bRegistered; >?ec"P%vS/  
} {L7+lz  
nAX/u[  
  四、小结 "x 3C3Zu.;  
? Y luX  
  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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