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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: xk=5q|u_-  
  )+2GF0%  
  一、实现方法 =\7o@ 38  
f,Vj8@p)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: ks=j v:  
/5:C$ik  
#pragma data_seg("shareddata") L{xCsJ3d  
HHOOK hHook =NULL; //钩子句柄 WXP=U^5Si  
UINT nHookCount =0; //挂接的程序数目 3A2X1V"  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ]8*#%^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Q/rOIHiI  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'r6s5 WC  
static int KeyCount =0; Y9fktg.  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 C5;=!B  
#pragma data_seg() 9u";%5 4  
p b:mw$XQ7  
  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。 3# G;uWN-  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: RYzDF+/  
3uO#/EbS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hmJ{'D1"  
cKey,UCHAR cMask) qCg`"/0  
{ D. !m*oq  
 BOOL bAdded=FALSE; }MAvEaUd  
 for(int index=0;index<MAX_KEY;index++){ !|K~)4%rj  
  if(hCallWnd[index]==0){ t b5k|  
   hCallWnd[index]=hWnd; 1qXqQA  
   HotKey[index]=cKey; FHWzwi*u}  
   HotKeyMask[index]=cMask; Dpp 3]en.  
   bAdded=TRUE; M^I*;{w6i  
   KeyCount++; (h>Jz  
   break; D@"g0SW4  
  } EMME?OW$  
 } WoGK05w  
 return bAdded; 'j>+eA>  
} p?S:J`q  
//删除热键 p@`rBzGp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yNVuSj  
{ X^mv sY  
 BOOL bRemoved=FALSE; =/wAk0c^y  
 for(int index=0;index<MAX_KEY;index++){ ro{q':Z3  
  if(hCallWnd[index]==hWnd){ ^zn j J\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ a86m?)-c  
    hCallWnd[index]=NULL; O<nJbsl_w  
    HotKey[index]=0; .U|e#t  
    HotKeyMask[index]=0; O8#}2  
    bRemoved=TRUE; .`4N#EjP  
    KeyCount--; QA_SS'*  
    break; \5UwZx\  
   } %Hdg,NH  
  } x  8lgDO  
 } jR<yV  
 return bRemoved; gbNPD*7g9  
} {6Tw+/`P  
-FA]%Pl<'  
D )z'FOaI  
  DLL中的钩子函数如下: x]umh{H~  
5fi6>>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |0:&d w?*!  
{ jSbO1go#  
 BOOL bProcessed=FALSE; A[L+w9  
 if(HC_ACTION==nCode) ]|g{{PWH  
 {  `=b)fE  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  Isv@V.  
   switch(wParam) [AE-~+m)^  
   {  pQr `$:ga  
    case VK_MENU: (9q61z A  
     MaskBits&=~ALTBIT; V#jFjObTN  
     break; T-|SBNFw;  
    case VK_CONTROL: XE);oL2xP  
     MaskBits&=~CTRLBIT; z:f[<`,GT  
     break; \M^L'Mkj  
    case VK_SHIFT: R?3^Kx  
     MaskBits&=~SHIFTBIT; Th,15H DA  
     break; 1c);![O  
    default: //judge the key and send message pUby0)}t  
     break; $(v1q[ig  
   } Z\8TpwD2  
   for(int index=0;index<MAX_KEY;index++){ -+4:} sD  
    if(hCallWnd[index]==NULL) I12WOL q  
     continue; D*3\4=6x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *IWO ,!  
    { vwQY_J8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $/ ;:Xb=q  
     bProcessed=TRUE; [O*5\&6  
    } c;DWSgIw  
   } NYtp&[s2-  
  } E>~DlL%  
  else if((lParam&0xc000ffff)==1){ //有键按下 5]cmDk  
   switch(wParam) J$6tCFD  
   { tWL3F?wd  
    case VK_MENU: (UWP=L1  
     MaskBits|=ALTBIT; #W[/N|~wx  
     break; nWpqAb  
    case VK_CONTROL: 0eq="|n^|  
     MaskBits|=CTRLBIT; y BF3Lms  
     break; Fy^*@&  
    case VK_SHIFT: K~ gt=NH  
     MaskBits|=SHIFTBIT; 1iBOf8  
     break; =*0<.Lo':  
    default: //judge the key and send message ecIxiv\  
     break; )70-q yA  
   } M@@l>"g@  
   for(int index=0;index<MAX_KEY;index++){ >mRA|0$  
    if(hCallWnd[index]==NULL) l6ayV  
     continue; nQ>?{"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bqpy@WiI S  
    { UZsL0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R,[ dEP  
     bProcessed=TRUE; AcV 2l  
    } b:Oa4vBa  
   } dc UaZfON  
  } Wkw.z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 EGWm0 F_  
   for(int index=0;index<MAX_KEY;index++){ _jt>%v4}4  
    if(hCallWnd[index]==NULL) &r s+x<  
     continue; 7+wy`xi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) K?0f)@\nx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0Q>f,}W%>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [5>f{L!<T<  
   } q_PxmPE@3v  
  } b*w izd  
 } KhK:%1po  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z0[_5Cm/  
} |uT|(:i84,  
?pq#|PI)  
  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: .Bxv|dji  
#(6^1S%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O ;,BzA-n  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .OI&Zm-  
9UlR fl  
  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: @jb -u S  
i> Wsc?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Cx(|ZD^  
{ ( <~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :t?Z  
 { +>BLox6  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "b)Y5[nW  
  SaveBmp(); u0^Vy#@_  
  return FALSE; +o+e*B7Eh  
 } }pk)\^/w/  
 …… //其它处理及默认处理 i\E}!Rwl+  
} i*-[-hn-V  
:E ]Ys  
#O3Y#2lI  
  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。 N<&"_jzm  
!EO*xxQ  
  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。 f.Wip)g  
Wtl/xA_  
  二、编程步骤 GQ=Zp3[  
i=Nq`BoQf  
  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"; xz!b@5DR'%  
y.h2hv]Bc  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; >uHU3<2&  
OP:i;%@c  
  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; 1%Yd] 1c(  
z$#q'+$  
  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; SP}!v5.  
']Q4SB"q  
  5、 添加代码,编译运行程序。 Vl"20):  
wm1`<r^M.  
三、程序代码 'OrGt_U  
DxuT23. (  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \gz(C`4{j  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &6 ymGo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (<bYoWrK#  
#if _MSC_VER > 1000 "AN*2)e4  
#pragma once ^,-2";2Xh  
#endif // _MSC_VER > 1000 ^"lVTDsU  
#ifndef __AFXWIN_H__ Jd]kg,/  
#error include 'stdafx.h' before including this file for PCH m5c=h  
#endif =&%}p[ 3g  
#include "resource.h" // main symbols SSr#MIS?  
class CHookApp : public CWinApp \kN?7b^  
{ *'?aXS -'r  
 public: g&E3Wc  
  CHookApp(); 0^lCZ,uq;  
  // Overrides pW[KC!  
  // ClassWizard generated virtual function overrides N.~zQVO#R  
  //{{AFX_VIRTUAL(CHookApp) zD"n7;  
 public: ,J*C'#sW  
  virtual BOOL InitInstance(); >O;V[H2[  
  virtual int ExitInstance(); $O'IbA  
  //}}AFX_VIRTUAL ;?h+8Z/{  
  //{{AFX_MSG(CHookApp) jw 4B^2}  
  // NOTE - the ClassWizard will add and remove member functions here. p<Oz"6_/~  
  // DO NOT EDIT what you see in these blocks of generated code ! nrEG4X9  
  //}}AFX_MSG F<V.OFt  
  DECLARE_MESSAGE_MAP() uM"_3je{W2  
}; _O,k0O   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j^1Yz}6nR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SH1S_EQ<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >TQNrS^$J  
BOOL InitHotkey(); #ET y#jKL  
BOOL UnInit(); 3< 'bi}{  
#endif <u_ vL WS  
wU}%]FqtZ=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |tr^ `Z  
#include "stdafx.h" Ndz'^c  
#include "hook.h" m[}@\y  
#include <windowsx.h> ,J&\) yTP  
#ifdef _DEBUG : L+%5Jq  
#define new DEBUG_NEW "Snt~:W>  
#undef THIS_FILE 4{lrtNd~K  
static char THIS_FILE[] = __FILE__; <B&vfKO^h  
#endif \\ZCi`O  
#define MAX_KEY 100 Ur9L8EdC  
#define CTRLBIT 0x04 }vX iqT  
#define ALTBIT 0x02 Y"  Ut  
#define SHIFTBIT 0x01 elGwS\sw  
#pragma data_seg("shareddata") R>D[I.  
HHOOK hHook =NULL; ^wIg|Gc  
UINT nHookCount =0; JHXtKgFX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k>)Uyw$!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 5 W!#,jz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 5AbY 59  
static int KeyCount =0; tMiy`CPh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift HcQ)XJPK  
#pragma data_seg() Sby(?yg  
HINSTANCE hins; U#G<cV79  
void VerifyWindow(); k`((6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b_vKP  
//{{AFX_MSG_MAP(CHookApp) C %i{{Y&l  
// NOTE - the ClassWizard will add and remove mapping macros here. m-2!r*(zt  
// DO NOT EDIT what you see in these blocks of generated code! w `nm}4M  
//}}AFX_MSG_MAP wEF"'T  
END_MESSAGE_MAP() 0j :u.x  
VkkC;/BBW  
CHookApp::CHookApp() vW-o%u*  
{ cE^Ljk  
 // TODO: add construction code here, c'INmc I|  
 // Place all significant initialization in InitInstance ;4QE.&s`  
} J=J!)\m  
.lAPlJOO  
CHookApp theApp; 2f0mr?l)N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t)5.m}  
{ ZPG~@lU  
 BOOL bProcessed=FALSE; DYF(O-hJK  
 if(HC_ACTION==nCode) 0g2rajS  
 { PLJDRp 2o  
  if((lParam&0xc0000000)==0xc0000000){// Key up {%\@Z-9%q,  
   switch(wParam) . H}R}^  
   { dZY|6  
    case VK_MENU: Q@uWh:  
     MaskBits&=~ALTBIT; qe5;Pq !G  
     break; "rrw~  
    case VK_CONTROL: {"2Hv;x  
     MaskBits&=~CTRLBIT; z(u,$vZ _  
     break; !sp`oM  
    case VK_SHIFT: -,+~W#n  
     MaskBits&=~SHIFTBIT; $Xh5N3  
     break; <KJ|U0/jGd  
    default: //judge the key and send message -zUBK  
     break; 'h@&rr@5  
   } S5:&_&R8[  
   for(int index=0;index<MAX_KEY;index++){ aCJ-T8?'  
    if(hCallWnd[index]==NULL) RG=i74a  
     continue; _f~$iY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xSqr=^  
    { 2*< PmKI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l<qEX O  
     bProcessed=TRUE; wv`ar>qVL  
    } l_4 ^TYF  
   } +^jm_+  
  } HRyhq ;C  
  else if((lParam&0xc000ffff)==1){ //Key down v$xurj:v#i  
   switch(wParam) 0|]d^bo  
   { 3ZN\F  
    case VK_MENU: v0TbQ  
     MaskBits|=ALTBIT; )H`V\ H[0P  
     break; U%0|LQk5  
    case VK_CONTROL: ]0O3kiVQ  
     MaskBits|=CTRLBIT; 1JJ1!& >  
     break; ESk:$`P  
    case VK_SHIFT: Mnk-"d  
     MaskBits|=SHIFTBIT; r,3\32[?  
     break; "Ec9.#U/  
    default: //judge the key and send message zC*dJXt@  
     break; >JA>np  
   } O)DAYBv^  
   for(int index=0;index<MAX_KEY;index++) P_b!^sq9  
   { acar-11_o/  
    if(hCallWnd[index]==NULL) *2}f $8  
     continue; 2.=G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HO_(it \  
    { , Y,^vzX6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); k7{|\w%  
     bProcessed=TRUE; H|7XfM  
    } +sTPTCLE  
   } hrO9_B|#  
  } 2#00<t\  
  if(!bProcessed){ `>b,'u6F  
   for(int index=0;index<MAX_KEY;index++){ \rATmjsKzS  
    if(hCallWnd[index]==NULL) s|:1z"q  
     continue; {-Mjs BR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )pe17T1|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @ULWVS#t2  
   } ZR-64G=L,  
  } 1G67#L)USq  
 } | lZJt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KT*>OYI  
} +V9xKhR;x  
-rjQ^ze  
BOOL InitHotkey() 9[W >`JKo  
{ 4*9t:D|}  
 if(hHook!=NULL){ (+cZP&o  
  nHookCount++; ()w;~$J  
  return TRUE; tl*h"du^  
 } hF5T9^8  
 else C(h Td%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7&OJ8B/  
  if(hHook!=NULL) 61_-G#W  
   nHookCount++; M# -E  
  return (hHook!=NULL); }%jpqip  
} $duT'G, -  
BOOL UnInit() D^V)$ME  
{ >dJ~  
 if(nHookCount>1){ [}GK rI  
  nHookCount--; ;"ESN)*|i  
  return TRUE;  +Mhk<A[s  
 } Y)$%-'=b+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~Hv>^u Mh  
 if(unhooked==TRUE){ dFhyT.Y?  
  nHookCount=0; ,!GoFu  
  hHook=NULL; 5XzsqeG|  
 } 7fO<=ei:  
 return unhooked; L<3+D  
} osd oL  
}p)Hw2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tLN^k;w  
{ t+q;}ZvG  
 BOOL bAdded=FALSE; 4[JF.O6}  
 for(int index=0;index<MAX_KEY;index++){ \%bJXTK&W  
  if(hCallWnd[index]==0){ *5*#Z~dut8  
   hCallWnd[index]=hWnd; ' (XB|5  
   HotKey[index]=cKey; Iz j-,a  
   HotKeyMask[index]=cMask; k~K;r8D/  
   bAdded=TRUE; bJ1Nf|3~E  
   KeyCount++; S w%6-  
   break; x- ue1  
  } yzT1Zg_ER  
 } &7>]# *  
 return bAdded; ~m,~;  
}  ;Ss!OFK  
Yt,MXm\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %#~wFW|]x  
{ YcclO  
 BOOL bRemoved=FALSE; v_pe=LC{-e  
 for(int index=0;index<MAX_KEY;index++){ DO~[VK%|  
  if(hCallWnd[index]==hWnd){ `H>&d K|/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Uf ]$I`T#  
    hCallWnd[index]=NULL; o@_i&4[MW  
    HotKey[index]=0; "aI)LlyCY  
    HotKeyMask[index]=0; ebNRZJ?C,  
    bRemoved=TRUE; ^ <`SUBI  
    KeyCount--; m.`I}  
    break; U<=d@knH  
   } 67&Q<`V1*q  
  } '[%Pdd]! E  
 } -3~S{)  
 return bRemoved; %e0X-tXcmX  
} f(eXny@Y  
Vn:v{-i  
void VerifyWindow() 7][fciZN  
{ eq8faC5  
 for(int i=0;i<MAX_KEY;i++){ 8IWT;%  
  if(hCallWnd!=NULL){ P]y{3y:XxM  
   if(!IsWindow(hCallWnd)){ NIQ}+xpC  
    hCallWnd=NULL; $IX(a4'  
    HotKey=0; dhxzW@'nIL  
    HotKeyMask=0; 1!;~Y#  
    KeyCount--; &v1E)/q{Z  
   } htL1aQ.  
  } d}Guj/cx,  
 } ~vA8I#.  
} S^|`*%pq  
islHtX VE  
BOOL CHookApp::InitInstance() x7^VU5w#  
{ O;V^Fk(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); a?GXVQ  
 hins=AfxGetInstanceHandle(); m-tn|m!J  
 InitHotkey(); V_m!<s r(  
 return CWinApp::InitInstance(); r r\u)D#)  
} 7A'E+>1d  
"q=ss:(  
int CHookApp::ExitInstance() LJb=9tp~  
{ }1[s,  
 VerifyWindow(); 'U ZzH$h  
 UnInit(); 1,$"'lKwt  
 return CWinApp::ExitInstance(); G4'Ee5(o  
} 0QPY+6  
LWhy5H;Es  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2vG X\W% 3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;8K> ]T)  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X 5}=|%Y  
#if _MSC_VER > 1000 aJjUy%  
#pragma once {g`!2"  
#endif // _MSC_VER > 1000 -:'%YHxX  
H<q|je}e  
class CCaptureDlg : public CDialog \<xo`2b  
{ V9Mr&8{S4  
 // Construction .{?; #Cdn  
 public: Ci 4c8  
  BOOL bTray; eAI|zk6  
  BOOL bRegistered; 2^Im~p~ByE  
  BOOL RegisterHotkey(); BQ[R)o  
  UCHAR cKey; 0[<' ygu  
  UCHAR cMask; g$"x,:2x{  
  void DeleteIcon(); n{~&^Nby*I  
  void AddIcon(); j r .{M  
  UINT nCount; Tmu2G/yi  
  void SaveBmp(); hJ[keaO  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }aa]1X(u  
  // Dialog Data CKe72OC  
  //{{AFX_DATA(CCaptureDlg) (6mw@gzr  
  enum { IDD = IDD_CAPTURE_DIALOG }; cL.>e=x$  
  CComboBox m_Key; Q"eqql<h#  
  BOOL m_bControl; *sB'D+-/  
  BOOL m_bAlt; ?G~rYETvw  
  BOOL m_bShift; l:u1P  
  CString m_Path; WL'!M&h  
  CString m_Number; &YD+ s%OL  
  //}}AFX_DATA Qh Rj*,  
  // ClassWizard generated virtual function overrides ('j'>"1H  
  //{{AFX_VIRTUAL(CCaptureDlg) 2sG1Hox  
 public: A0;{$/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); };"_Ku4#-  
 protected: %G6x\[,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b">"NvlB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !H c6$  
  //}}AFX_VIRTUAL ?/hS1yD;  
  // Implementation MZA%ET,l,<  
 protected: g26_#4 P  
  HICON m_hIcon; O5+Ah%  
  // Generated message map functions Nknd8>Hy+  
  //{{AFX_MSG(CCaptureDlg) |t3}>+"?z  
  virtual BOOL OnInitDialog(); jY/(kA]}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @raJB'  
  afx_msg void OnPaint(); ~mah.8G  
  afx_msg HCURSOR OnQueryDragIcon(); Wie0r@5E  
  virtual void OnCancel(); {IBbN05 ;  
  afx_msg void OnAbout(); [rAi9LSO"  
  afx_msg void OnBrowse(); g2LvojR  
  afx_msg void OnChange(); 3&c'3y:b  
 //}}AFX_MSG Q($@{[lT  
 DECLARE_MESSAGE_MAP() egfd=z=2un  
}; lq`7$7-4  
#endif Y}yh6r;i  
lSd tw b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file R&P^rrC@B5  
#include "stdafx.h" ]PL\;[b>  
#include "Capture.h" l_+q a6C*  
#include "CaptureDlg.h" km lb,P  
#include <windowsx.h> N5cC!K  
#pragma comment(lib,"hook.lib") `\3RFr  
#ifdef _DEBUG /9P7;1?  
#define new DEBUG_NEW $mf6!p4  
#undef THIS_FILE !@ AnwV]  
static char THIS_FILE[] = __FILE__; b1=! "Y@  
#endif 6B>*v`T:  
#define IDM_SHELL WM_USER+1 fbah~[5}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LT,zk)5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u^VQwu6?G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >k/ rJ[Sc  
class CAboutDlg : public CDialog 6BXZGE  
{ Nlc3S+$`z  
 public: md : Wx  
  CAboutDlg(); ;\/ RgN  
  // Dialog Data 4Xn-L&0z  
  //{{AFX_DATA(CAboutDlg) 8N#.@\'kz.  
  enum { IDD = IDD_ABOUTBOX }; "oR%0pU*  
  //}}AFX_DATA [Mv'*.7  
  // ClassWizard generated virtual function overrides 6"+bCx0:  
  //{{AFX_VIRTUAL(CAboutDlg) !|"LAr9u  
 protected:  .^rs VNG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O G7U+d6  
  //}}AFX_VIRTUAL nK]L0*s  
  // Implementation >-`-D=!V  
 protected: np7!y U  
  //{{AFX_MSG(CAboutDlg) Et)j6xz/F  
  //}}AFX_MSG D;DI8.4`N  
  DECLARE_MESSAGE_MAP() }\ya6Gi8  
}; dda*gq/p  
x$bCbg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6a{b%e`  
{ jrYA5>=>#  
 //{{AFX_DATA_INIT(CAboutDlg) >?$qKu  
 //}}AFX_DATA_INIT ;@[ax{ J  
} Reg%ah|$/=  
XO/JnJ^B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $\nAGmp@  
{ YJ01-  
 CDialog::DoDataExchange(pDX); @c%h fI  
 //{{AFX_DATA_MAP(CAboutDlg) nqib`U@"  
 //}}AFX_DATA_MAP w"E.Va  
} 0"c(n0L  
sYyya:ykxT  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gG,gL 9o  
 //{{AFX_MSG_MAP(CAboutDlg) Q\Nz^~dQ:Y  
 // No message handlers tWI4x3 &2  
 //}}AFX_MSG_MAP <\5E{/7Tl  
END_MESSAGE_MAP() EwOi` g  
R94 ID@LF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) /y5a~3  
: CDialog(CCaptureDlg::IDD, pParent) tt]ZGn*  
{ |z.Z='`  
 //{{AFX_DATA_INIT(CCaptureDlg) FZJ sZeO  
  m_bControl = FALSE; VrZ6m  
  m_bAlt = FALSE; #,\qjY  
  m_bShift = FALSE; rY(h }z  
  m_Path = _T("c:\\"); 3 *[YM7y  
  m_Number = _T("0 picture captured."); ZS?4<lXF  
  nCount=0; lEiOE]  
  bRegistered=FALSE; eTY" "EWU  
  bTray=FALSE; PQ`~qM:3st  
 //}}AFX_DATA_INIT `1U?^9Nf  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;,jms~ik  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^-pHhh|g  
} orr6._xw  
]$ iqJL  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) HP eN0=7>  
{ YWUCrnr  
 CDialog::DoDataExchange(pDX); a2`|6M;  
 //{{AFX_DATA_MAP(CCaptureDlg) Zjkrne{  
  DDX_Control(pDX, IDC_KEY, m_Key); m}>#s3KPA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i slg5  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dQH9NsV7g  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); aMycvYzH  
  DDX_Text(pDX, IDC_PATH, m_Path); CLX!qw]@ +  
  DDX_Text(pDX, IDC_NUMBER, m_Number); uf&Ke k,  
 //}}AFX_DATA_MAP Lb%Wz*Fa%!  
} ojQjx|Q}  
lQnqPQY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W_P&;)E  
//{{AFX_MSG_MAP(CCaptureDlg) )]a{cczL"  
 ON_WM_SYSCOMMAND() $bT<8:g  
 ON_WM_PAINT() G^=C#9c.m  
 ON_WM_QUERYDRAGICON() is [p7-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;wvhe;!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \z>L,U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Xeo2 < @[  
//}}AFX_MSG_MAP ] M#OS$_O@  
END_MESSAGE_MAP() MehMhHY  
Qt+;b  
BOOL CCaptureDlg::OnInitDialog() D 4fHNk)kZ  
{ XAf,k&f3  
 CDialog::OnInitDialog(); *D$[@-7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @mB*fl?-  
 ASSERT(IDM_ABOUTBOX < 0xF000); !uJD hC  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !E+.(  
 if (pSysMenu != NULL) l;C00ZBOc  
 { ]NrA2i?  
  CString strAboutMenu; Sx", Zb  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K_X10/#b&  
  if (!strAboutMenu.IsEmpty()) Lupug"p0   
  { xmI!N0eta  
   pSysMenu->AppendMenu(MF_SEPARATOR); G uLU7a  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); } JePEmj  
  } 2!+saf^-,  
 } K4\#b}P!  
 SetIcon(m_hIcon, TRUE); // Set big icon ^YLk&A)X  
 SetIcon(m_hIcon, FALSE); // Set small icon ;m[-yqX  
 m_Key.SetCurSel(0);  ;Iu}Q-b*  
 RegisterHotkey(); %kRQ9I".  
 CMenu* pMenu=GetSystemMenu(FALSE); ..g?po  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @ !UuK;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wgb e7-{  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); z[q#Dw  
 return TRUE; // return TRUE unless you set the focus to a control  *Fe  
} ^+m6lsuA  
a$r<%a6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XpLK0YI  
{ L93&.d@m9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I#m0n%-[  
 { \q0wY7w  
  CAboutDlg dlgAbout; */ ~_3  
  dlgAbout.DoModal(); tXgsWG?v[H  
 } AD ,  
 else d 1 8>0R  
 { YFF\m{#  
  CDialog::OnSysCommand(nID, lParam); \ LQ?s)~  
 } l".LtUf-  
} dP0%<Q|  
sr+Y"R  
void CCaptureDlg::OnPaint() xKl!{A9$w  
{ nF8|*}w  
 if (IsIconic()) 9 ^G. ]W]  
 { f""+jc1  
  CPaintDC dc(this); // device context for painting f ;[\'_.*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /R2K3E#  
  // Center icon in client rectangle ;E"TOC  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z+qTMm  
  int cyIcon = GetSystemMetrics(SM_CYICON); m|}};8  
  CRect rect; }52]  
  GetClientRect(&rect); {Gd<+tQg  
  int x = (rect.Width() - cxIcon + 1) / 2; Vl0 J!JK_  
  int y = (rect.Height() - cyIcon + 1) / 2; U=<d;2N#  
  // Draw the icon h]6"~ m  
  dc.DrawIcon(x, y, m_hIcon); ]%RX\~Q.4  
 } #fy#G}c  
 else zO)>(E?  
 { nMniHB'  
  CDialog::OnPaint(); Hkcr+BQ  
 } ?W#>9WQi  
} "o=*f/M  
]Tb ?k+a  
HCURSOR CCaptureDlg::OnQueryDragIcon() B_^ ~5_0:  
{ ww_gG5Fc$  
 return (HCURSOR) m_hIcon; LV^V`m0#  
} L7_qs+  
8op,;Z7Y  
void CCaptureDlg::OnCancel() qB`-[A9HPe  
{ 4! Cu>8B  
 if(bTray) 4z_>CiA  
  DeleteIcon(); *$t<H-U-  
  CDialog::OnCancel(); % |6t\[gn  
} /G zA89N(  
Slk__eC  
void CCaptureDlg::OnAbout() 5BL4VGwJ  
{ -FAAP&LG  
 CAboutDlg dlg; Yt 9{:+[RK  
 dlg.DoModal(); /``4!jU  
} syEWc(5  
.=j]PckJO  
void CCaptureDlg::OnBrowse() 5$v,%~$Xds  
{ bJ[{[|yEd  
 CString str; F~NmLm  
 BROWSEINFO bi; 0>  
 char name[MAX_PATH]; P,$|.p d'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); aR iD}P*V  
 bi.hwndOwner=GetSafeHwnd(); DrG9Kky{  
 bi.pszDisplayName=name; ST#OO!  
 bi.lpszTitle="Select folder"; X-tc Ud  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; kIm)Um  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); MH"{N "|  
 if(idl==NULL) (&2 5 8i,  
  return; _TB,2 R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1eg/<4]hA  
 str.ReleaseBuffer(); dG6 G  
 m_Path=str; tWs ]Zd  
 if(str.GetAt(str.GetLength()-1)!='\\') ]BY^.!Y  
  m_Path+="\\"; n9Mi?#xIp  
 UpdateData(FALSE); EFb1Y{u^\!  
} X3C"A|HE9  
!+& Rn\e%7  
void CCaptureDlg::SaveBmp() To x{Sk3L  
{ j}0W|*  
 CDC dc; i.eu$~F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *, /ADtL  
 CBitmap bm; jTo-xP{lC  
 int Width=GetSystemMetrics(SM_CXSCREEN); eXHk6[%[  
 int Height=GetSystemMetrics(SM_CYSCREEN); 6`KAl rH  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?s4-2g  
 CDC tdc; _[yBwh  
 tdc.CreateCompatibleDC(&dc); ~Rs_ep'+Q2  
 CBitmap*pOld=tdc.SelectObject(&bm); s Zan.Kc#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); q/ x(:yol  
 tdc.SelectObject(pOld); $=7'Cm ?  
 BITMAP btm; )c'5M]V  
 bm.GetBitmap(&btm); &3 QdQ n,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; F9hh- "(Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); bB|UQaCl  
 BITMAPINFOHEADER bih; 8PWx>}XPt  
 bih.biBitCount=btm.bmBitsPixel; JGP<'6"L$  
 bih.biClrImportant=0; ~$#"'Tl4J  
 bih.biClrUsed=0; A!([k}@=j  
 bih.biCompression=0; 2OXcP!\Y  
 bih.biHeight=btm.bmHeight; /~w!7n<7  
 bih.biPlanes=1; }gk37_}X\I  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8.-0_C*U;  
 bih.biSizeImage=size; K;%P_f/KJP  
 bih.biWidth=btm.bmWidth; XIM!]  
 bih.biXPelsPerMeter=0; %M=[h2SN  
 bih.biYPelsPerMeter=0; OnNWci|7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :r?gD2q  
 static int filecount=0; 9H@I<`qGC  
 CString name; <ptgFR+  
 name.Format("pict%04d.bmp",filecount++); =0te.io)3O  
 name=m_Path+name; X^!n'$^u  
 BITMAPFILEHEADER bfh; nXgnlb=  
 bfh.bfReserved1=bfh.bfReserved2=0;  ~F?vf@k  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Xb0$BAP  
 bfh.bfSize=54+size; VO _! +  
 bfh.bfOffBits=54; Z(fXN$  
 CFile bf; =oZHN,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {Y>5 [gp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /.Yf&2X\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "N"$B~W*  
  bf.WriteHuge(lpData,size); XLEEd?Vct9  
  bf.Close(); P`/;3u/P  
  nCount++; g@IV|C( *0  
 } :}QBrd  
 GlobalFreePtr(lpData); 3\x@G)1  
 if(nCount==1) d~i WV6Va  
  m_Number.Format("%d picture captured.",nCount); kq;1Ax0 {  
 else I r8,=  
  m_Number.Format("%d pictures captured.",nCount); y v6V1gK  
  UpdateData(FALSE); pkW }\r  
} XJx$HM&0M  
7Hghn"ol  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _|f1q  
{ &|/@;EA$8  
 if(pMsg -> message == WM_KEYDOWN) {WBe(dc_%  
 { RMinZ}/  
  if(pMsg -> wParam == VK_ESCAPE) #w%d  
   return TRUE; )-98pp7~BB  
  if(pMsg -> wParam == VK_RETURN) Z XCq>  
   return TRUE; #xUX1(  
 } h |Ofi  
 return CDialog::PreTranslateMessage(pMsg); $8/=@E{51  
} *QKxrg  
]><K8N3Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8Zj=:;  
{ 9((BOq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ AcZ{B<  
  SaveBmp(); vY 0EffZ  
  return FALSE; w=NM==cLj  
} mS\ gh)<h  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ldd8'2  
 CMenu pop; NCW<~   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); myq@X(K  
 CMenu*pMenu=pop.GetSubMenu(0); :G.u{cw  
 pMenu->SetDefaultItem(ID_EXITICON); +8<|P&fH  
 CPoint pt; /+V}.  
 GetCursorPos(&pt); X;e=d+pw  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z3n273W>6  
 if(id==ID_EXITICON) ae%Bl[  
  DeleteIcon(); ;mT|0&o>#  
 else if(id==ID_EXIT) y?6J%~\WP  
  OnCancel(); Y ~TR`y  
 return FALSE; iXoEdt)  
} L3/SIoqd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]\ ~s83?X  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #mIgk'kW<  
 AddIcon(); (DLk+N4UHA  
 return res; {[|je ]3v  
} G '1K6  
1bz%O2U-(  
void CCaptureDlg::AddIcon() c-jE1y<  
{ J-UqH3({Z,  
 NOTIFYICONDATA data; !_?K(X~/  
 data.cbSize=sizeof(NOTIFYICONDATA); 7 @W}>gnf  
 CString tip; !:]/MpQ ?  
 tip.LoadString(IDS_ICONTIP); >z'T"R/  
 data.hIcon=GetIcon(0); <r>1W~bp.q  
 data.hWnd=GetSafeHwnd(); +$uQ_ve  
 strcpy(data.szTip,tip); 5cUz^ >  
 data.uCallbackMessage=IDM_SHELL; V}Ok>6(~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; whW% c8  
 data.uID=98; 3>T2k }  
 Shell_NotifyIcon(NIM_ADD,&data); o?{-K-'B$  
 ShowWindow(SW_HIDE); "Wb>y*S   
 bTray=TRUE; +s j2C  
} Hhzi(<e^  
9cIKi#Bl  
void CCaptureDlg::DeleteIcon() [mcER4]}  
{ UfkQG`G9H  
 NOTIFYICONDATA data; _x`oab0@  
 data.cbSize=sizeof(NOTIFYICONDATA); !'z"V_x~  
 data.hWnd=GetSafeHwnd(); 3/{,}F$  
 data.uID=98; !hugn6  
 Shell_NotifyIcon(NIM_DELETE,&data); WHy r;m3)  
 ShowWindow(SW_SHOW); vNDf1B5z  
 SetForegroundWindow(); A4tb>O M  
 ShowWindow(SW_SHOWNORMAL); `C&@6{L  
 bTray=FALSE; o)L)|  
} 'PvOOhm,  
4T>d%Tt+)  
void CCaptureDlg::OnChange() 9 gc0Ri[4m  
{ Ods~tM  
 RegisterHotkey(); df)S}}#H  
} ="('  #o  
ROr|n]aJj  
BOOL CCaptureDlg::RegisterHotkey() K2qKkV@  
{ {+^&7JX  
 UpdateData(); ce<88dL  
 UCHAR mask=0; Ew )1O9f  
 UCHAR key=0; 5h l!zA?  
 if(m_bControl) 7Tc^}Q  
  mask|=4; Eh+m|A  
 if(m_bAlt) NtG^t}V  
  mask|=2; a|-ozBFR  
 if(m_bShift) qQwf#&  
  mask|=1; @M*oq2U;  
  key=Key_Table[m_Key.GetCurSel()]; XD%GNZ  
 if(bRegistered){ ' j\~> a3\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); W.(Q u-AE(  
  bRegistered=FALSE; Xd@ d$  
 } 7n[0)XR>  
 cMask=mask; \gGTkH  
 cKey=key; )@],0yL  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *o=[p2d"X  
 return bRegistered; 8^pu C  
} 0V+v)\4FE  
$#-O^0D  
  四、小结 ' 7H"ezt  
@5h(bLEP  
  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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