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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: P3v4!tR  
  "bz]5c~  
  一、实现方法 v>_83P`  
8~3I^I_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: G+<id1  
yw{r:fy  
#pragma data_seg("shareddata") ~zVe?(W  
HHOOK hHook =NULL; //钩子句柄 l[C_vUg  
UINT nHookCount =0; //挂接的程序数目 TSVlZy~Xo  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 gH*(1*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V=8npz   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey J[c`Qq:&e  
static int KeyCount =0; rp|A88Q/!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 35L\  
#pragma data_seg() 7MsJ*E n  
LIT`~D  
  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。 tJA"BP3f  
t:b}Mo0  
  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: W j`f^^\HJ  
|Qn>K   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR @r(3   
cKey,UCHAR cMask) w+a5/i@  
{ z L9:e7o  
 BOOL bAdded=FALSE; PbFbi hg  
 for(int index=0;index<MAX_KEY;index++){ )a9C3-8Y'  
  if(hCallWnd[index]==0){ POf xN.  
   hCallWnd[index]=hWnd; t#w,G  
   HotKey[index]=cKey; g!OcWy)7  
   HotKeyMask[index]=cMask; `26.+>Z7  
   bAdded=TRUE; M*D@zb0ia  
   KeyCount++; 15OzO.Ud  
   break; 5 9i2*<k  
  } E6M*o+Y  
 } PcjeuJZ  
 return bAdded; 9 9^7Ek!z#  
} O%w'n z"  
//删除热键 204"\ mv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #qv!1$}2  
{ u=Xpu,q  
 BOOL bRemoved=FALSE; P"o|kRO  
 for(int index=0;index<MAX_KEY;index++){ *$Zy|&[Z  
  if(hCallWnd[index]==hWnd){ +O^}  t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I'[;E.KU  
    hCallWnd[index]=NULL; Rtlc&Q.b  
    HotKey[index]=0; VP<LY/'f  
    HotKeyMask[index]=0; QL*RzFAD 3  
    bRemoved=TRUE; (G(M"S SC  
    KeyCount--; >XX93  
    break; `I(ap{  
   } |;&I$'i  
  } | GN/{KH]  
 } 'p@m`)Z  
 return bRemoved; )0g!lCfb  
} `gyk e2n  
/F6"uZSt4  
5K-,k^T}  
  DLL中的钩子函数如下: .zTkOk L  
Fk9]u^j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f4&;l|R0a  
{ yYSoJqj Q  
 BOOL bProcessed=FALSE; DQ9aq.;  
 if(HC_ACTION==nCode) ?cn`N|   
 { %e)? Mem  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5\h6'  
   switch(wParam) yXqC  
   {  yPg0 :o-  
    case VK_MENU: ;Sg,$`]  
     MaskBits&=~ALTBIT; i0*Cs#(=h  
     break; T Qx<lw  
    case VK_CONTROL: 57O|e/2  
     MaskBits&=~CTRLBIT; 6ND*L0  
     break; ;mC|> wSZ  
    case VK_SHIFT: ]2YC7  
     MaskBits&=~SHIFTBIT; fRq+pUx U  
     break; 0A-yQzL|  
    default: //judge the key and send message #lMC#Ld  
     break; ,_s.amL3O{  
   } u:tcL-;U  
   for(int index=0;index<MAX_KEY;index++){ ei"c|/pO  
    if(hCallWnd[index]==NULL) [j0jAl  
     continue; J8ScKMUN2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @(+\*]?^&  
    { \DWKG~r-%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )>"pm {g2  
     bProcessed=TRUE; _~*j=XRs  
    } pred{HEye  
   } h:sf?X[  
  } Db;>MWt+e  
  else if((lParam&0xc000ffff)==1){ //有键按下 '-Oh$hqCx|  
   switch(wParam) U#Iwe=  
   { ov daK"q2  
    case VK_MENU: dBS_N/  
     MaskBits|=ALTBIT; ~*]7f%L-  
     break; G9GHBwT  
    case VK_CONTROL: 06Q9X!xD  
     MaskBits|=CTRLBIT; s^4wn:*$zd  
     break; `^ a:1^  
    case VK_SHIFT: teC/Uf 5  
     MaskBits|=SHIFTBIT; :Nwv &+  
     break; ] w0Y5H "  
    default: //judge the key and send message {47Uu%XT  
     break; +$#XV@@~  
   } aof'shS8  
   for(int index=0;index<MAX_KEY;index++){ b5I 8jPj4c  
    if(hCallWnd[index]==NULL) gm =C0Sp?  
     continue; ecO$L<9>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :ln?PT  
    { w4_Xby)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); f`_{SU"3  
     bProcessed=TRUE; f9 :=6  
    } w'XSkI_ay  
   } {d]B+'  
  } :>Qu;Z1P  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [>\e@ =  
   for(int index=0;index<MAX_KEY;index++){ adRIg:2  
    if(hCallWnd[index]==NULL) c5:0`~5Fn  
     continue; 5rc3jIXc{|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o iC@ /  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !&3"($-U3G  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R lbJ4`a  
   } D>ou,  
  } B&y?Dc  
 } r!w*y3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); bg_io*K  
} Iza;~8dH5  
SGba6b31  
  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: {P\Ob0)q  
{K}Dpy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P}(c0/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a=x &sz\x  
F 9d6#~  
  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: "%S-(ue:  
VUP. \Vry  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VS_\bIC  
{ q?)5yukeF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  TU6YS<  
 { aY;34SF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "gzn%k[D9m  
  SaveBmp(); e'c3.sQ|?  
  return FALSE; 'HCRi Z<  
 } ;l<Hen*  
 …… //其它处理及默认处理 49O_A[(d  
} =<)/lz] H  
(l9jczi  
>Q^ mR  
  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。 %cDDu$9;  
W$&*i1<a+  
  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。 Ag*?>I  
?I:_FT  
  二、编程步骤 Ey%[t  
?iEn~9WCS  
  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"; rj4Mq:pJ  
g\?07@Zd|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; g 4|ai*^  
G`&P|xYg  
  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; mA_EvzXk\  
(n_.bSI  
  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; $uUyp8F  
}H saJ=1U  
  5、 添加代码,编译运行程序。 RBg2iG$ 8|  
$G9E=wn  
三、程序代码 d{) =E8wE  
T+rym8.p  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wV{j CQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |u$*'EsP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ w)1SZ }  
#if _MSC_VER > 1000 WE_'u+!B  
#pragma once sSD&'K=lq  
#endif // _MSC_VER > 1000 yd'cLZd<}  
#ifndef __AFXWIN_H__ B# .xs>{N  
#error include 'stdafx.h' before including this file for PCH H4{7,n  
#endif 'O9Yu{M  
#include "resource.h" // main symbols DYC2bs>  
class CHookApp : public CWinApp 3m2y<l<  
{ g2*}XS 3  
 public: $P#+Y,r~\  
  CHookApp(); \ $t{K  
  // Overrides NwQ$gDgu t  
  // ClassWizard generated virtual function overrides 3UZ_1nY  
  //{{AFX_VIRTUAL(CHookApp) 4`cfFowK~  
 public: {ehYE^%N  
  virtual BOOL InitInstance(); x^Qij!mB%  
  virtual int ExitInstance(); gvo5^O+)HH  
  //}}AFX_VIRTUAL uH7rt  
  //{{AFX_MSG(CHookApp) 1DL+=-  
  // NOTE - the ClassWizard will add and remove member functions here. cXN0D\%`  
  // DO NOT EDIT what you see in these blocks of generated code ! #BS!J&a  
  //}}AFX_MSG l^o>7 cM  
  DECLARE_MESSAGE_MAP() rq1~%S  
}; EG8z&^O x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); vl|3WYA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z~v-8aw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k<f0moxs'  
BOOL InitHotkey(); F8{T/YhZ  
BOOL UnInit(); 66+]D4(k  
#endif 8JW0;H<  
J4iu8_eH!D  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <Nc9F['&#  
#include "stdafx.h" *laFG <;  
#include "hook.h" 3O2vY1Y2  
#include <windowsx.h> QV*la=j/  
#ifdef _DEBUG 0TICv2l!  
#define new DEBUG_NEW VeQ [A?pER  
#undef THIS_FILE e(`r"RrQ  
static char THIS_FILE[] = __FILE__; 98_os2`  
#endif  x}d5 Y  
#define MAX_KEY 100 $[J\sokpY  
#define CTRLBIT 0x04 je>gT`8  
#define ALTBIT 0x02 rEU1 VvE  
#define SHIFTBIT 0x01 ;;U&mhz`  
#pragma data_seg("shareddata") ZX{eggXl  
HHOOK hHook =NULL;  P/]8+_K  
UINT nHookCount =0; BCd0X. m(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey I>-}ys`[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *]kE3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r.:f.AY{  
static int KeyCount =0; q?L*Luu+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  wJvk  
#pragma data_seg() G`;mSq6i  
HINSTANCE hins; F%{z E ANm  
void VerifyWindow(); U^-J_ yq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) wjOqCF"  
//{{AFX_MSG_MAP(CHookApp) ;[Eso p  
// NOTE - the ClassWizard will add and remove mapping macros here. o5Knot)Oy  
// DO NOT EDIT what you see in these blocks of generated code! [r'hX#  
//}}AFX_MSG_MAP x0TE+rf5   
END_MESSAGE_MAP() Gt!Hm(  
: B1 "=ly  
CHookApp::CHookApp() TFhYu  
{ <!|=_W6  
 // TODO: add construction code here, 6Hd^qouid  
 // Place all significant initialization in InitInstance D6e<1W  
} *1>Tc,mb  
CyB1`&G>  
CHookApp theApp; lWf(!=0m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?:zMrlX  
{ /T 6Te<68^  
 BOOL bProcessed=FALSE; 'XSHl?+q  
 if(HC_ACTION==nCode) )oS~ish  
 { d{C8}U  
  if((lParam&0xc0000000)==0xc0000000){// Key up jar?"o  
   switch(wParam) mj9]M?]  
   { :4COPUBpPV  
    case VK_MENU: \D[~54  
     MaskBits&=~ALTBIT; sn@)L~$V  
     break; g|!=@9[dv  
    case VK_CONTROL: Ww{-(Ktx  
     MaskBits&=~CTRLBIT; -r0oO~KT  
     break; 1;>RK  
    case VK_SHIFT: BTE&7/i 21  
     MaskBits&=~SHIFTBIT; SC2g5i`  
     break; a<V Mh79*  
    default: //judge the key and send message 52.hJNq#L  
     break; VrFI5_M/  
   } )9!ZkZbv_m  
   for(int index=0;index<MAX_KEY;index++){ a$6pA@7}  
    if(hCallWnd[index]==NULL) Io_7  
     continue; Z \ -  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ g"su #  
    { Q?9eu%G6I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); OQT i$2  
     bProcessed=TRUE; fAvB!e  
    } HlX7A 1i/  
   } VAa;XVmB  
  } &0-Pl.M  
  else if((lParam&0xc000ffff)==1){ //Key down N=:xyv  
   switch(wParam) bW'Y8ok[v  
   { eA/}$.R  
    case VK_MENU: r8L'C  
     MaskBits|=ALTBIT; B#4 J![BX  
     break; H329P*P  
    case VK_CONTROL: q?&JS  
     MaskBits|=CTRLBIT; [3W+h1  
     break; @jD19=  
    case VK_SHIFT: .q$/#hN:e  
     MaskBits|=SHIFTBIT; ]6HnK%  
     break; + V-&?E(  
    default: //judge the key and send message yXc@i)9w3  
     break; Ob -k`@_|  
   } )v.\4Q4  
   for(int index=0;index<MAX_KEY;index++) NW Pd~l+  
   { /bqJ6$  
    if(hCallWnd[index]==NULL) "S&1J8D|  
     continue; }HZ'i;~r|9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nSU7,K`PM  
    { JhB$s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v8A{ q  
     bProcessed=TRUE; QOF'SEq"k  
    } 9, 792b  
   } N{zou?+  
  } u+8?'ZT,  
  if(!bProcessed){ 2l4`h)_q  
   for(int index=0;index<MAX_KEY;index++){ Al]z =  
    if(hCallWnd[index]==NULL) k :zGv  
     continue; :.\h.H;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XpOQBXbt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); HM\gOz  
   } \V.U8asfI  
  } s-xby~  
 } VnMiZAHR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E}=F   
} ~3m} EL  
&oiBMk`*  
BOOL InitHotkey() z[_Gg8e  
{ YA^g[,  
 if(hHook!=NULL){ Z?'){\$*  
  nHookCount++; knZ<V%/e  
  return TRUE; cNqw(\rr  
 } :y[tZ&*<_?  
 else /?QBMI  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); oI%.oP}G  
  if(hHook!=NULL) :~9F/Jx  
   nHookCount++; w9a6F  
  return (hHook!=NULL); cV)~%e/  
} GD .>u  
BOOL UnInit() <3Hu(Jx<O  
{ iD9hqiX&  
 if(nHookCount>1){ =t-503e.J  
  nHookCount--; ::kpAE]  
  return TRUE; )F35WP~  
 } BLhuYuON  
 BOOL unhooked = UnhookWindowsHookEx(hHook); eM`"$xc Oe  
 if(unhooked==TRUE){ aA.TlG@zP  
  nHookCount=0; sFxciCpN  
  hHook=NULL; "'"dcA   
 } -n'%MT=Cd  
 return unhooked; P(Hh%9'(  
} 5=Y\d,SS"  
bpe WK&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gs77")K&  
{ /-ky'S9  
 BOOL bAdded=FALSE; pF"IDC  
 for(int index=0;index<MAX_KEY;index++){ O8ZHIs  
  if(hCallWnd[index]==0){ tI(co5 W  
   hCallWnd[index]=hWnd; .{W)E  
   HotKey[index]=cKey; c^8y/wfok  
   HotKeyMask[index]=cMask; n-_-;TYH  
   bAdded=TRUE; ^KMZB  
   KeyCount++; U9B|u`72  
   break; _/!IjB:(70  
  } c8jq.y v  
 } u5FlT3hY.  
 return bAdded; VIxcyp0X  
} #65Uei|F`+  
oMi"X"C:q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,!4 (B1@  
{ /fc@=CO  
 BOOL bRemoved=FALSE; ,Z I"+v  
 for(int index=0;index<MAX_KEY;index++){ "GofQ5,|  
  if(hCallWnd[index]==hWnd){ -gV'z5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W;C41>^?/  
    hCallWnd[index]=NULL; ",T-'>h$2R  
    HotKey[index]=0; KmkPq]  
    HotKeyMask[index]=0; ),)]gw71QW  
    bRemoved=TRUE; [e'Ts#($A  
    KeyCount--; vQ}llA h  
    break; w#,C{6  
   } ?o9g5Z  
  } ~dK)U*Q  
 } &u_f:Pog  
 return bRemoved; 6]^}GyM!  
} l8hOryB&  
[?hc.COE  
void VerifyWindow() I.\fhNxHY  
{ /^\6q"'  
 for(int i=0;i<MAX_KEY;i++){ 'DQKpk'  
  if(hCallWnd!=NULL){ ZOG6  
   if(!IsWindow(hCallWnd)){ ]f q.r  
    hCallWnd=NULL; j{9sn,<:  
    HotKey=0; x AD:Z "  
    HotKeyMask=0; nV%1/e"5  
    KeyCount--; v7/qJ9l  
   } e? fFh,a  
  } ~V"D|U;i +  
 } pRj1b^F5y  
} D[)g-_3f6<  
Dw^d!%Ala  
BOOL CHookApp::InitInstance() ]|[oL6"  
{ o84!$2P+w  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;p#)z/zZ  
 hins=AfxGetInstanceHandle(); MI@id  
 InitHotkey(); T)]5k3{  
 return CWinApp::InitInstance(); Pz1pEyuL  
} 2, ` =i  
[L,Tf_t^Y  
int CHookApp::ExitInstance() aQaO.K2  
{ u%S&EuX  
 VerifyWindow(); yla&/K;|*  
 UnInit(); 70L{u+wIy  
 return CWinApp::ExitInstance(); </|IgN$w`  
} *O|Z[>  
Llk4 =p  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file R;f!s/^)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) cSBYC_LU  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ n8[ sl]L  
#if _MSC_VER > 1000 +I7n6s\  
#pragma once &/4W1=>(  
#endif // _MSC_VER > 1000 wbzAX  
wEo/H  
class CCaptureDlg : public CDialog %uyRpG3,  
{ YZdp/X6x  
 // Construction ^e>`ob  
 public: ]v3 9ag_hu  
  BOOL bTray; tm(.a ?p  
  BOOL bRegistered; O s@ d&wm  
  BOOL RegisterHotkey(); Bls\)$  
  UCHAR cKey; ayuj)]b  
  UCHAR cMask; A_}F  
  void DeleteIcon(); K<KyX8$P0  
  void AddIcon(); x(7K=K']  
  UINT nCount; m6)8L?B   
  void SaveBmp(); 9Bl_t}0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Im1e/F]  
  // Dialog Data [MYd15  
  //{{AFX_DATA(CCaptureDlg) <IGQBu#ZH  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7%9Sz5z  
  CComboBox m_Key; {SW}S_  
  BOOL m_bControl; Ym5q#f)|  
  BOOL m_bAlt; { D1.  
  BOOL m_bShift; ` IiAtS  
  CString m_Path; _YY:}'+  
  CString m_Number; *?K3jy{  
  //}}AFX_DATA b:Dr _|  
  // ClassWizard generated virtual function overrides )W~w72j-  
  //{{AFX_VIRTUAL(CCaptureDlg) # &o3[.)9  
 public: Q uy5H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |Z<NM#1  
 protected: `(?E-~#'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qIa|sV\w0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AxUj CerNf  
  //}}AFX_VIRTUAL -#H>kbs  
  // Implementation ^ S'}RZ*>  
 protected: ;GO>#yg4Eh  
  HICON m_hIcon; s2Ivd*=mT  
  // Generated message map functions veg\A+:'  
  //{{AFX_MSG(CCaptureDlg) oW(p (>  
  virtual BOOL OnInitDialog(); ~fn2B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %8tlJQvu  
  afx_msg void OnPaint(); vAi kd#C)  
  afx_msg HCURSOR OnQueryDragIcon(); #vYdP#nWb  
  virtual void OnCancel(); Nrva?W_i  
  afx_msg void OnAbout(); Iw8;",e2  
  afx_msg void OnBrowse(); tB4- of3+  
  afx_msg void OnChange(); Iu^# +n  
 //}}AFX_MSG k`6T% [D]  
 DECLARE_MESSAGE_MAP() Zg%U4m:  
}; iVzv/Lqm1  
#endif ~oh=QakW  
r>sk@[4h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file iTi<X|X  
#include "stdafx.h" `9Zoq=/  
#include "Capture.h" .0S.7w3dZo  
#include "CaptureDlg.h" b40zYH`'{  
#include <windowsx.h> 5@bLD P  
#pragma comment(lib,"hook.lib") KD*,u{v;  
#ifdef _DEBUG 2GA6@-u\  
#define new DEBUG_NEW V=BF"S;-'  
#undef THIS_FILE ~S15tZ $  
static char THIS_FILE[] = __FILE__; sXkWs2!  
#endif %p)6m 2Sb  
#define IDM_SHELL WM_USER+1 |j$&W;yC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IY?[0S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gR"'|c   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V= U=  
class CAboutDlg : public CDialog a;D{P`%n  
{ ~sshhuF  
 public: /cUcfe#X  
  CAboutDlg(); &xMR{:  
  // Dialog Data ={-\)j  
  //{{AFX_DATA(CAboutDlg) R3<>]/1p|P  
  enum { IDD = IDD_ABOUTBOX }; c 's=>-X  
  //}}AFX_DATA 7-.Y VM~R  
  // ClassWizard generated virtual function overrides /Ou`$2H87  
  //{{AFX_VIRTUAL(CAboutDlg) *r$Yv&c,  
 protected: k5]s~* ,0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MbC7`Sp&i  
  //}}AFX_VIRTUAL #.UooFk+Y  
  // Implementation (EGsw o  
 protected: o-Pa3L=  
  //{{AFX_MSG(CAboutDlg) ge9j:S{  
  //}}AFX_MSG 9%j_"+<c  
  DECLARE_MESSAGE_MAP() \@vR*E  
}; ")"VQ|$y  
V03U"eI="  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ttuQ ,SD  
{ *g]q~\b/;  
 //{{AFX_DATA_INIT(CAboutDlg) z;@;jQ7  
 //}}AFX_DATA_INIT iXK.QktHw  
} ilEWxr;,  
3:7J@>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -z./6dQ  
{ :TqvL'9o  
 CDialog::DoDataExchange(pDX); j{SRE1tqh  
 //{{AFX_DATA_MAP(CAboutDlg) t/LQ|/xo  
 //}}AFX_DATA_MAP fGHYs  
} _?kjIF  
p<*3mbgGO  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) vF0#]  
 //{{AFX_MSG_MAP(CAboutDlg) k`U")lv  
 // No message handlers xGCW-YR9  
 //}}AFX_MSG_MAP !*ct3{m  
END_MESSAGE_MAP() pw" !iG}  
M.))UKSF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mufi>}  
: CDialog(CCaptureDlg::IDD, pParent) /Pv d[oF  
{ <61T)7  
 //{{AFX_DATA_INIT(CCaptureDlg) Vrz x;V%  
  m_bControl = FALSE; eTem RNz  
  m_bAlt = FALSE; n~l9`4wJY  
  m_bShift = FALSE; q%%8oaEI  
  m_Path = _T("c:\\"); A(2_hl-  
  m_Number = _T("0 picture captured."); 0]?} kY  
  nCount=0; #g*U\y  
  bRegistered=FALSE; ]/hF!eO  
  bTray=FALSE; VliX'.-  
 //}}AFX_DATA_INIT Gf( hN|X.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q;W[$yvW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); O|=5+X  
} oa$-o/DhB  
{m~.'DU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \7rFfN3  
{ c[J(H,mt/  
 CDialog::DoDataExchange(pDX); A}pmr  
 //{{AFX_DATA_MAP(CCaptureDlg) ggtGecKm  
  DDX_Control(pDX, IDC_KEY, m_Key); ?TA%P6Lw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;= ^kTb`X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a|rN %hA4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QPB@qx#@  
  DDX_Text(pDX, IDC_PATH, m_Path); 5[}3j1  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Osncl5PD)  
 //}}AFX_DATA_MAP 9W88_rE'e}  
} ".A+'pJ  
yoiKt; S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'NHtCs=F   
//{{AFX_MSG_MAP(CCaptureDlg) nXPl\|pXt  
 ON_WM_SYSCOMMAND() IV*@}~BJ  
 ON_WM_PAINT()  al/Mgo  
 ON_WM_QUERYDRAGICON() 9o5W\.A7[D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %Z9&zmO  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I[,tf!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &HBqweI  
//}}AFX_MSG_MAP ya7PF~:E-  
END_MESSAGE_MAP() F5la:0fb  
!=%0  
BOOL CCaptureDlg::OnInitDialog() q)vdDdRe_  
{ zmd,uhNc:  
 CDialog::OnInitDialog(); )a"rj5~-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .XDY1~w0  
 ASSERT(IDM_ABOUTBOX < 0xF000); U$jw8I'.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); w/_n$hX  
 if (pSysMenu != NULL) VQ wr8jXye  
 { " !43,!<  
  CString strAboutMenu; \ldjWc<S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); nF$n[:  
  if (!strAboutMenu.IsEmpty()) ,ab_u@  
  { &c!d}pU}  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8axz`2`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !-%fCg(B  
  } I3sH8/*  
 } b-4g HW  
 SetIcon(m_hIcon, TRUE); // Set big icon 7OuzQzhcK  
 SetIcon(m_hIcon, FALSE); // Set small icon n[DQ5l  
 m_Key.SetCurSel(0); & D@/_m $  
 RegisterHotkey(); n.9k<  
 CMenu* pMenu=GetSystemMenu(FALSE); vC$Q4>m  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MO}J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dQP7CP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }?[^q  
 return TRUE; // return TRUE unless you set the focus to a control 74f3a|vx/  
} 0-Z sV3I&  
)Dn~e#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V)x(\ls]SX  
{ &%J+d"n(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +LBDn"5  
 { ,K4*0!TXP  
  CAboutDlg dlgAbout; `"~s<+  
  dlgAbout.DoModal(); ) D_ZZPq_  
 } 1$S;#9PQ  
 else h M{&if  
 { ~{69&T}9  
  CDialog::OnSysCommand(nID, lParam); Arvxl(R\4  
 } 5W hR |  
} rb8c^u#r  
+!_?f'kv`  
void CCaptureDlg::OnPaint() 0u0<)gdX  
{ @L?X}'0xI4  
 if (IsIconic()) X3nt*G1dL  
 { ?}f+PP,  
  CPaintDC dc(this); // device context for painting F.;G6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QG{).|pm  
  // Center icon in client rectangle yWS #{| o(  
  int cxIcon = GetSystemMetrics(SM_CXICON); iMgfF_r  
  int cyIcon = GetSystemMetrics(SM_CYICON); r(UEPGu|~l  
  CRect rect;  3Ee8_(E\  
  GetClientRect(&rect); 6AS'MD%&  
  int x = (rect.Width() - cxIcon + 1) / 2; ?l\1n,!:8  
  int y = (rect.Height() - cyIcon + 1) / 2; 9iMQq40  
  // Draw the icon P "S=RX#+  
  dc.DrawIcon(x, y, m_hIcon); >)5=6{x  
 } 2 uuI_9 "^  
 else >y P`8Oq[  
 { 2kv%k3 Q{  
  CDialog::OnPaint(); D+$k  
 } kk`BwRh)d;  
} ,$;g'z!N  
m]g"]U:  
HCURSOR CCaptureDlg::OnQueryDragIcon() oECM1'=Bf  
{ q\ihye  
 return (HCURSOR) m_hIcon; !sF! (u7  
} <9za!.(zu  
OBF3)L]  
void CCaptureDlg::OnCancel() G'|Emu=4  
{ w8~J5XS  
 if(bTray) g4n& k  
  DeleteIcon(); p)  x.Y  
  CDialog::OnCancel(); b0\'JZ  
} B@ab[dm280  
iEDZ\\,  
void CCaptureDlg::OnAbout() {?a9>g-BW  
{ G5^gwG+  
 CAboutDlg dlg; WZ.d"EE"  
 dlg.DoModal(); HSt|Ua.c/h  
} kBPFk t2  
m7:E7 3:  
void CCaptureDlg::OnBrowse() 'WqSHb7  
{ %}z/_QZ  
 CString str; xP@VK!sc  
 BROWSEINFO bi; ` eB-C//  
 char name[MAX_PATH]; mwuFXu/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); kvU0$1  
 bi.hwndOwner=GetSafeHwnd(); Y`FGD25`  
 bi.pszDisplayName=name; Ru%: z>Y  
 bi.lpszTitle="Select folder"; +mBJvrI  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^$][ah  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vFfvvRda4x  
 if(idl==NULL) Z=: oIAe  
  return; JCIm*6~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !g? ~<`   
 str.ReleaseBuffer(); -Q@jL{Ue  
 m_Path=str; #unE>#DW  
 if(str.GetAt(str.GetLength()-1)!='\\') Y^)VHE]  
  m_Path+="\\"; &77]h%B >  
 UpdateData(FALSE); ivdw1g|)h  
} {Y5h*BD>  
my#qmI  
void CCaptureDlg::SaveBmp() 9Ao0$|@b  
{ ]{9oB-;,  
 CDC dc; mB(*)PwZ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); B0c}5V  
 CBitmap bm; '-#6;_ i<  
 int Width=GetSystemMetrics(SM_CXSCREEN); +n(H"I7cU  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,2>:h"^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b("JgE`  
 CDC tdc; }@'xEx  
 tdc.CreateCompatibleDC(&dc); -X@;"0v  
 CBitmap*pOld=tdc.SelectObject(&bm); oeXNb4; 4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >J=x";,D|~  
 tdc.SelectObject(pOld); YtQKsM  
 BITMAP btm; LvpHR#K)F5  
 bm.GetBitmap(&btm); T0_9:I`&  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; wAHb 5>!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); syh0E= If_  
 BITMAPINFOHEADER bih; |-7<?aw"  
 bih.biBitCount=btm.bmBitsPixel; GS{:7%=j  
 bih.biClrImportant=0; 6RZ[X[R[}  
 bih.biClrUsed=0; v)JQb-<  
 bih.biCompression=0; \h^bOxh  
 bih.biHeight=btm.bmHeight; hMJ \a  
 bih.biPlanes=1; )!dELS \ix  
 bih.biSize=sizeof(BITMAPINFOHEADER); <.3@-z>w2,  
 bih.biSizeImage=size; tC+9W1o  
 bih.biWidth=btm.bmWidth; b* Ipg8n+  
 bih.biXPelsPerMeter=0; -<#n7b  
 bih.biYPelsPerMeter=0; i7~oZ)w  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ej,MmLu~^  
 static int filecount=0; NrvS/ cI!t  
 CString name; '4sT+q  
 name.Format("pict%04d.bmp",filecount++); BO\l>\)Ir  
 name=m_Path+name; #f|-l$a)3a  
 BITMAPFILEHEADER bfh; o*n""m  
 bfh.bfReserved1=bfh.bfReserved2=0; Fc}wu W  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2W pe( \(  
 bfh.bfSize=54+size; EpGe'S  
 bfh.bfOffBits=54; 8O{]ML  
 CFile bf; :0T]p"y4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?HIc=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `n-e.{O((  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u2<:mu[|P  
  bf.WriteHuge(lpData,size); v%3)wD  
  bf.Close(); ;lGa.RD[a  
  nCount++; d$rJW m5H  
 } KHr8\qLH  
 GlobalFreePtr(lpData); _| 8"&*T^  
 if(nCount==1) *Oz5I  
  m_Number.Format("%d picture captured.",nCount); | 7>1)  
 else RA[` Cp"  
  m_Number.Format("%d pictures captured.",nCount); !w f N~.Y  
  UpdateData(FALSE); UO"8 I2rB  
} uMsKF%m  
7k6rhf7H  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg)  CjQ_oNI  
{ +:&(Ag  
 if(pMsg -> message == WM_KEYDOWN) 3:Co K#  
 { D.Cm&  
  if(pMsg -> wParam == VK_ESCAPE) l O, 2  
   return TRUE; j<deTK;.  
  if(pMsg -> wParam == VK_RETURN) b&~uK"O'7d  
   return TRUE; #Mbt%m  
 } !^axO  
 return CDialog::PreTranslateMessage(pMsg); ^e>v{AE%  
} 4v2(YJ%u  
(kp}mSw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >\DXA)nc  
{ qUtVqS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0nie>  
  SaveBmp(); D3.sR\Hxf  
  return FALSE; BpP\C!:^  
}  NkO$ M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (f#W:]o/  
 CMenu pop; LO"HwN43h  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !.t'3~dUf$  
 CMenu*pMenu=pop.GetSubMenu(0); !hH6!G  
 pMenu->SetDefaultItem(ID_EXITICON); nBiSc*  
 CPoint pt; 0^(.(:  
 GetCursorPos(&pt); U}A+jJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r~s03g0  
 if(id==ID_EXITICON) l"*>>/U k  
  DeleteIcon(); He!0&B\7h  
 else if(id==ID_EXIT) r)j#Skh].  
  OnCancel(); R:.7 c(s  
 return FALSE; ^\+6*YE 4  
} ; wHuL\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [ z$J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) La9@h"  
 AddIcon(); 3al5Vu2:  
 return res; *fd` .}  
} E"G. _<3J8  
?tA- `\E  
void CCaptureDlg::AddIcon() G~esSL^G/  
{ rkD4}jV  
 NOTIFYICONDATA data; <K\F/`c  
 data.cbSize=sizeof(NOTIFYICONDATA); +V'r >C:  
 CString tip; },Z -w_H  
 tip.LoadString(IDS_ICONTIP); U'lmQrF!  
 data.hIcon=GetIcon(0); p>}N9v;Bo  
 data.hWnd=GetSafeHwnd(); gwqK`ww  
 strcpy(data.szTip,tip); [\.>BK  
 data.uCallbackMessage=IDM_SHELL; gdG: &{|x  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ))KsQJ"V  
 data.uID=98; Z#J{tXZc  
 Shell_NotifyIcon(NIM_ADD,&data); ' xi..  
 ShowWindow(SW_HIDE); '6WDs]\  
 bTray=TRUE; rLKDeB  
} WG}QLcP  
@pS[_!EqYz  
void CCaptureDlg::DeleteIcon() d?{2A84S  
{ '\_)\`a|  
 NOTIFYICONDATA data; fglZjT  
 data.cbSize=sizeof(NOTIFYICONDATA); gRqz8UI  
 data.hWnd=GetSafeHwnd(); {W4t]Ff  
 data.uID=98; {(MG: B  
 Shell_NotifyIcon(NIM_DELETE,&data); 1b!l+ 8!  
 ShowWindow(SW_SHOW); cEQa 6  
 SetForegroundWindow(); [cW  
 ShowWindow(SW_SHOWNORMAL); v Cmh3TQ  
 bTray=FALSE; mE7Jv)@  
} aEM#V  
R;.WOies4  
void CCaptureDlg::OnChange() -"nYCF  
{ L"-&B$B:  
 RegisterHotkey(); ./g#<  
} 7r;A wa  
'{u#:TTj  
BOOL CCaptureDlg::RegisterHotkey() kg@J.   
{ Q?;ntzi  
 UpdateData(); }N|/b"j9  
 UCHAR mask=0; e.kt]l  
 UCHAR key=0; {r}}X@|5  
 if(m_bControl) v}mmY>M%  
  mask|=4; c]&VUWQ  
 if(m_bAlt) PJ.jgN(r  
  mask|=2; pxC5a i  
 if(m_bShift) f 0#V^[%Q  
  mask|=1; ^R$dG[Qf  
  key=Key_Table[m_Key.GetCurSel()]; j,-7J*A~  
 if(bRegistered){ F>Oh)VL,Ev  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~VGK#'X:  
  bRegistered=FALSE; Cwh;+3?C|  
 } [*<&]^  
 cMask=mask; gjWH }(K  
 cKey=key; a[!d)Y:zx  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;7A,'y4f  
 return bRegistered;  "O 'I  
} ;C<A }  
n)H0;25L  
  四、小结 `->k7a0<b1  
`j$d(+Gv  
  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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