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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: 'w;J) _Yc2  
  C-Y7n5  
  一、实现方法 4&L,QSJ V  
*rm[\  
  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: |jWA >S  
/HSg)  
#pragma data_seg("shareddata") DfOig LG*  
HHOOK hHook =NULL; //钩子句柄 :h0!giqoQ  
UINT nHookCount =0; //挂接的程序数目 :W'.SRD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JV;VR9-l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5"x1Pln  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey >G0ihhVt  
static int KeyCount =0; ZE/Aj/7Qy  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Ox aS<vQ3  
#pragma data_seg() wxG*mOw  
0KZsWlD:L  
  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。 s BuXw a  
z.t,qi$;{U  
  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: .p~.S&)  
7pH[_]1"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A~a7/N6s;  
cKey,UCHAR cMask) <Lle1=qQ  
{ @a]`C $ 6  
 BOOL bAdded=FALSE; }V+&o\4  
 for(int index=0;index<MAX_KEY;index++){ M7gqoJM'Q  
  if(hCallWnd[index]==0){ (elkk#  
   hCallWnd[index]=hWnd; @<S'f<>g  
   HotKey[index]=cKey; %CrpUx  
   HotKeyMask[index]=cMask; YL4yT`*  
   bAdded=TRUE; ?I.bC   
   KeyCount++; "W}+~Sn  
   break; h5; +5B}D  
  } *; 6LX  
 } -,"eN}P^  
 return bAdded; fb!>@@9Z  
} 8L))@SA+uJ  
//删除热键 .6i +_B|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NC x)zJ\S  
{ ^X*l&R_=R  
 BOOL bRemoved=FALSE; )B^T7{  
 for(int index=0;index<MAX_KEY;index++){ K!G/iz9SB  
  if(hCallWnd[index]==hWnd){ #/K71Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xAf?E%_pi  
    hCallWnd[index]=NULL; Nu; 9  
    HotKey[index]=0; Z3 na.>Z  
    HotKeyMask[index]=0; 0te[i*G  
    bRemoved=TRUE; $O9#4A;  
    KeyCount--; M[Jy?b)  
    break; i:^ 8zW  
   } *pGbcBQ  
  } U&gl$/4U@  
 } a3_pF~Qx  
 return bRemoved; e5sQl1  
} #fF';Y7  
hTAZGV(  
8r jiW#  
  DLL中的钩子函数如下: gM v0[~;u  
^+dL7g?+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eG5xJA^  
{ Oyjhc<6  
 BOOL bProcessed=FALSE; eKqo6P:#f  
 if(HC_ACTION==nCode) f:A1j\A?  
 { YR~)07  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _ Av_jw`m  
   switch(wParam) 4p(\2?B%f  
   {  z`y^o*qc]  
    case VK_MENU: ){i 9,u")  
     MaskBits&=~ALTBIT;  u+]8Sq  
     break; &m@DK>  
    case VK_CONTROL: v}"DW?  
     MaskBits&=~CTRLBIT; :AC(  \  
     break; j{NcDe pLn  
    case VK_SHIFT: `c_Wk] i  
     MaskBits&=~SHIFTBIT; {X&H  
     break; meyO=>  
    default: //judge the key and send message I6 Q{ Axy  
     break; Qnv)\M1  
   } nA#dXckoc  
   for(int index=0;index<MAX_KEY;index++){ zAd%dbU|  
    if(hCallWnd[index]==NULL) )>^!X$`3  
     continue; sMWNzt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y)+l U  
    { -IG@v0_w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i}LVBx"K(  
     bProcessed=TRUE; $%3%&+z$I  
    } \w@ "`!%  
   } (, uW-  
  } Md1ePp]  
  else if((lParam&0xc000ffff)==1){ //有键按下 a"X9cU[  
   switch(wParam) #; >v,Jo  
   { ]KRw[}z  
    case VK_MENU: /:aY)0F0<&  
     MaskBits|=ALTBIT; YZ^;xV  
     break; HY7#z2L  
    case VK_CONTROL: 32,Y 3!%  
     MaskBits|=CTRLBIT; ;[[oZ  
     break; sxU 0Fg   
    case VK_SHIFT: XXPpj< c  
     MaskBits|=SHIFTBIT; QpMi+q Y  
     break; 5*Y(%I<  
    default: //judge the key and send message A#Jx6T`a  
     break; #?RT$L>n  
   } ,9~2#[|lq  
   for(int index=0;index<MAX_KEY;index++){ _B^Q;54c  
    if(hCallWnd[index]==NULL) Ouc$M2m0!  
     continue; &BJ"T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~myY-nEY  
    { ^1,VvLA+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E(Y}*.\]#s  
     bProcessed=TRUE; XlU`jv+  
    } W v!%'IB  
   } ]F*fQ Ncjy  
  } 6{TUs>~  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9g`o+U{  
   for(int index=0;index<MAX_KEY;index++){ [I5}q&  
    if(hCallWnd[index]==NULL) - 1tiy.^$F  
     continue; L+2<J,   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TKZ[H$Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); W(,3j{d2i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $~<]G)*Z  
   } 5}"9)LT@@w  
  } EHX/XM  
 } @PyZ u7'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4,qhWe`/  
} jq12,R2+)  
~-o[v-\  
  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: 78/,rp#'_  
=^`?O* /;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^ah9:}Ll  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ) i=.x+Q  
f#b;s<G  
  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:  MON]rj7  
*'hJ5{U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6 ly`lu9  
{ R&]#@PW^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w j<fi  
 { w>h\643  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cCbZ*  
  SaveBmp(); g.T:72"  
  return FALSE; swLrp 74  
 } #8qhl  
 …… //其它处理及默认处理 U/9_:  
} EK$3T5e  
;dZuO[4\  
B 42t  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 B0|!s  
}GL@?kAGR5  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 zX}t1:nc  
h3t);}Y}D9  
  二、编程步骤 5v,_ Hgh  
R-J^%4U`7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";  6>&h9@  
#l#8-m8g)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K:(E"d;  
%+HZ4M+hV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; yU'<b.]  
<S68UN(Ke  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ,v$Q:n|  
r6gfxW5  
  5、 添加代码,编译运行程序。 ME.a * v  
6,a:s:$>}R  
三、程序代码 ;Bwg'ThT  
6tF_u D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (rm*KD"]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) M2lvD&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yr/G1?k%ML  
#if _MSC_VER > 1000 S^T ><C  
#pragma once 7B{LRm6;Vu  
#endif // _MSC_VER > 1000 d=d*:<Zx  
#ifndef __AFXWIN_H__ 8(ej]9RObU  
#error include 'stdafx.h' before including this file for PCH lgQ"K(zY  
#endif |Q+:vb:  
#include "resource.h" // main symbols '|^x[8^  
class CHookApp : public CWinApp  jH>`:  
{ ^Fpc8D,  
 public: _=-B%m  
  CHookApp(); Cd2A&RB  
  // Overrides 3>QkO.b  
  // ClassWizard generated virtual function overrides #%7)a;'  
  //{{AFX_VIRTUAL(CHookApp) @A'@%Zv-  
 public: 'M!M$<j  
  virtual BOOL InitInstance(); O_\%8*;  
  virtual int ExitInstance(); !QS j*)V#  
  //}}AFX_VIRTUAL W.CbNou  
  //{{AFX_MSG(CHookApp) dJ>~  
  // NOTE - the ClassWizard will add and remove member functions here. 7!U^?0?/  
  // DO NOT EDIT what you see in these blocks of generated code ! `i<omZ[aT  
  //}}AFX_MSG @|([b r|O  
  DECLARE_MESSAGE_MAP() xM)6'= x6  
}; O+OUcMa,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ACOn}yH  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gE: ?C2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v6P2v  
BOOL InitHotkey(); f9D01R fo  
BOOL UnInit(); Dl@Jj?zc  
#endif `br$kB  
Z@,[a  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. d$hBgJe>N  
#include "stdafx.h" %y_{?|+  
#include "hook.h" TyhO+;  
#include <windowsx.h> 76cLf~|d~  
#ifdef _DEBUG 50""n7I<%  
#define new DEBUG_NEW H)+QkQb}  
#undef THIS_FILE z3I |jy1  
static char THIS_FILE[] = __FILE__; /V GI@"^v  
#endif nO+R >8,Q  
#define MAX_KEY 100 Jb*E6-9G  
#define CTRLBIT 0x04 rld8hFj  
#define ALTBIT 0x02 VYjt/\ Z  
#define SHIFTBIT 0x01 {$g3R@f^~  
#pragma data_seg("shareddata") AVi&cvhs  
HHOOK hHook =NULL; IGNU_w4j  
UINT nHookCount =0; ,&.$r/x|?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey V]NCFG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 2Gh&h(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lg +>.^7k  
static int KeyCount =0; R*/s#*gmL  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F3[,6%4v  
#pragma data_seg() Q[{RN ab  
HINSTANCE hins; Ad&VOh+0  
void VerifyWindow(); $[UUf}7L   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) wJj:hA}  
//{{AFX_MSG_MAP(CHookApp) p(6 sN=  
// NOTE - the ClassWizard will add and remove mapping macros here. P; h8  
// DO NOT EDIT what you see in these blocks of generated code! ?N^1v&Q  
//}}AFX_MSG_MAP H*e+ 2  
END_MESSAGE_MAP() +z 4E:v  
&`oybm-p(  
CHookApp::CHookApp() TV=K3F5)M  
{ McpQ7\*h  
 // TODO: add construction code here, dci<Rz`h  
 // Place all significant initialization in InitInstance 5th?m>  
} [ ou$*  
y @S_CB 47  
CHookApp theApp; =f!clhO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) YjH~8==  
{ >, [@SF%  
 BOOL bProcessed=FALSE; q=}1ud}1  
 if(HC_ACTION==nCode) DD2K>1A1  
 {  TJ1h[  
  if((lParam&0xc0000000)==0xc0000000){// Key up Wy%FF\D.Y  
   switch(wParam) 6$[7hlE  
   { U*b7 Pxq;  
    case VK_MENU: zz /4 ()u  
     MaskBits&=~ALTBIT; 3)yL#hXg)  
     break; xHMFYt+0$G  
    case VK_CONTROL: | kP utB  
     MaskBits&=~CTRLBIT; SL-;h#-y 4  
     break; PD&gC88  
    case VK_SHIFT: hHHQmK<r  
     MaskBits&=~SHIFTBIT; axpZ`BUc  
     break; )+R n[MMp  
    default: //judge the key and send message wZs 2 aa  
     break; qV6WT&)T  
   } hJsP;y:@Lm  
   for(int index=0;index<MAX_KEY;index++){ UWidT+'Sa  
    if(hCallWnd[index]==NULL) J ZkQ/vp(  
     continue; Pt f(p`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a>x6n3{  
    { *MB >,HU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g(Q1d-L4e  
     bProcessed=TRUE; K|YB)y  
    } aCI3Tx&2qT  
   } BlQ X$s]  
  } ^Kg n:l  
  else if((lParam&0xc000ffff)==1){ //Key down u~aRFQ:  
   switch(wParam) Qz3Z_V4k9  
   { aL%E#  
    case VK_MENU: 4hODpIF  
     MaskBits|=ALTBIT; SiUu**zC  
     break; $rI 1|;^  
    case VK_CONTROL: Fn7OmxfD  
     MaskBits|=CTRLBIT; vFB^h1k~.M  
     break; ZP5 !O[Ut  
    case VK_SHIFT: JJM<ywPGp  
     MaskBits|=SHIFTBIT; 2 rr=FJ  
     break; [orL.D]  
    default: //judge the key and send message =MMd&  
     break; l<BV{Gl  
   } !1fZ7a  
   for(int index=0;index<MAX_KEY;index++) U8AH,?]#  
   { QeG9CS)E}j  
    if(hCallWnd[index]==NULL) vaGF(hfTA  
     continue; N@L{9ak1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e"52'zAV-  
    { ;}j(x;l>t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w7o`B R  
     bProcessed=TRUE; naW!b&:  
    } r34MDUZdI  
   } Id##367R  
  } y;uR@{  
  if(!bProcessed){ 31@Lr[!  
   for(int index=0;index<MAX_KEY;index++){ t2s/zxt  
    if(hCallWnd[index]==NULL) 10i$b<O  
     continue; o$buoGSPc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  +l/v`=C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {BT/P!  
   } :Ys~Lt54  
  } S.)Jp -&K  
 } l6&\~Z(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); avL_>7q  
} =jJEl=*S  
C!*.jvhT  
BOOL InitHotkey() qQi\/~Y[:  
{ 4] uj+J  
 if(hHook!=NULL){ 6:O<k2=2  
  nHookCount++; }}{n|l+R5  
  return TRUE; weSq |f  
 } kB> ~Tb0  
 else 9MYk5q.X:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =y4dR#R(\  
  if(hHook!=NULL) QCF'/G  
   nHookCount++; ^w.hI5ua)  
  return (hHook!=NULL); ~?AEtl#&"  
} C=/B\G/.9  
BOOL UnInit() J+J,W5t^  
{ #uw&u6*\q  
 if(nHookCount>1){ ]m b8R:a1  
  nHookCount--; U8w_C\Q  
  return TRUE; [/UchU]DT  
 } *q*3SP/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Wc[,kc  
 if(unhooked==TRUE){ a/,>fv9;$  
  nHookCount=0; akxNT_   
  hHook=NULL; u] };QR  
 } q8 ?kBKP  
 return unhooked; g4$(%]  
} n%s%i-[5B  
\A"o[A2v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) by X!,  
{ ^ RA'E@ "  
 BOOL bAdded=FALSE; rNii,_  
 for(int index=0;index<MAX_KEY;index++){ FM >ae-L-  
  if(hCallWnd[index]==0){ `t&{^ a&Y"  
   hCallWnd[index]=hWnd; |)29"_Kk5  
   HotKey[index]=cKey; "y,YC M`  
   HotKeyMask[index]=cMask; Xq*^6*E-}  
   bAdded=TRUE; o@Oz a  
   KeyCount++; ^Tm`motzh  
   break; Ki\.w~Qs  
  } 8Ojqm#/f  
 } K>@yk9)vi  
 return bAdded; HUi?\4  
} /Vn>(;lo  
!Qe ;oMqy}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) aa`(2%(:  
{ ej`%}e%2  
 BOOL bRemoved=FALSE; ?;XEb\Kf  
 for(int index=0;index<MAX_KEY;index++){ t'rN7.d  
  if(hCallWnd[index]==hWnd){ _\}'5nmw\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d,V#5l-6  
    hCallWnd[index]=NULL; ,Of^xER`  
    HotKey[index]=0; O1J&Lwpk,  
    HotKeyMask[index]=0; q8v[u_(yD  
    bRemoved=TRUE; <Kd(fFe  
    KeyCount--; Q+ ^ &  
    break; -n|bi cP  
   } 1cLtTE  
  } d(T4Kd$r  
 } CubQ6@,  
 return bRemoved; .$qa?$@  
} jxh:z  
lLx!_h  
void VerifyWindow() q@|+`>h  
{ n/+X3JJ  
 for(int i=0;i<MAX_KEY;i++){ W$rWg>4>  
  if(hCallWnd!=NULL){ ~RhUg~o  
   if(!IsWindow(hCallWnd)){ #j QauO  
    hCallWnd=NULL; J7+G"_)'  
    HotKey=0; +I3jI <  
    HotKeyMask=0; :v&[ !  
    KeyCount--; SS=<\q#MS  
   } >cu%Cs=m  
  } t'eqk#rq  
 } ,ks2&e  
} ,=:K&5mCv  
gg'1q3OjM  
BOOL CHookApp::InitInstance() ~VGnE:  
{ kQ`tY`3F  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); LKIMT  
 hins=AfxGetInstanceHandle(); : \+xXb{  
 InitHotkey(); >XD?zF)6  
 return CWinApp::InitInstance(); {3~VLdy  
} ?\}Gi(VVE  
{ "y/;x/  
int CHookApp::ExitInstance() `g)}jo`W  
{ Bt+^H6cb  
 VerifyWindow(); $)i`!7`4=  
 UnInit(); 7L{1S v  
 return CWinApp::ExitInstance(); `ONjEl  
} m>@hh#kBg  
-aoYoJ '  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4T@:_G2b  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _gvFs %J  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ;[v!#+yml  
#if _MSC_VER > 1000 R'Sd'pSDN  
#pragma once _C?j\Wy  
#endif // _MSC_VER > 1000 CdolZW-!"  
SepjF  
class CCaptureDlg : public CDialog K:PH: e  
{ { i5?R,a)  
 // Construction D BT4 W/  
 public: "g{q=[U}  
  BOOL bTray; LK^|JEu  
  BOOL bRegistered; :RaQ =C  
  BOOL RegisterHotkey(); (o^tmH*  
  UCHAR cKey; Rn1oD3w  
  UCHAR cMask; yk+ 50/L  
  void DeleteIcon(); $*Ucfw1T  
  void AddIcon(); zTz}H*U  
  UINT nCount; `c`VIq?  
  void SaveBmp(); Ma YU%h0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `zd,^.i5~  
  // Dialog Data 7+O)AU{  
  //{{AFX_DATA(CCaptureDlg) )`u17 {  
  enum { IDD = IDD_CAPTURE_DIALOG }; KII{GDR]  
  CComboBox m_Key; a:kAo0@":j  
  BOOL m_bControl; 4ot<Uw5  
  BOOL m_bAlt; %( )d$.F  
  BOOL m_bShift; %go2tv:|W  
  CString m_Path; )H8_.]|  
  CString m_Number; ;Rrh$Ag  
  //}}AFX_DATA %pC<T*f  
  // ClassWizard generated virtual function overrides ,/;Ae w;  
  //{{AFX_VIRTUAL(CCaptureDlg) 1'kO{Ge*p:  
 public: =C"[o\]VV  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  q6 CrUn  
 protected: pwFp<O"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ewDYu=`*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -^_m(@A<~  
  //}}AFX_VIRTUAL "F F$Q#)  
  // Implementation _jWs(OmJ  
 protected: `MtzA^Xr  
  HICON m_hIcon; 8fC4j`!  
  // Generated message map functions K9!HW&?<|  
  //{{AFX_MSG(CCaptureDlg) }LHYcNw^z  
  virtual BOOL OnInitDialog(); ]33!obM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TO wd+]B  
  afx_msg void OnPaint(); %xt9k9=vZ  
  afx_msg HCURSOR OnQueryDragIcon(); aukcO ;oG<  
  virtual void OnCancel(); tpfgUZ{  
  afx_msg void OnAbout(); Z}W{ iD{  
  afx_msg void OnBrowse(); --yF%tRMP  
  afx_msg void OnChange(); h\s/rZg=r  
 //}}AFX_MSG ] l,BUf-O  
 DECLARE_MESSAGE_MAP() du65=w4E!  
}; ?OD$`{1  
#endif 2qMiX|Y  
wQ_4_W  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L9GLj Rp-  
#include "stdafx.h" qBA)5Sv\V  
#include "Capture.h" GkGiQf4hh  
#include "CaptureDlg.h" _&gi4)q  
#include <windowsx.h> z7K{ ,y  
#pragma comment(lib,"hook.lib") *ap,r&]#F  
#ifdef _DEBUG (q)}`1d'  
#define new DEBUG_NEW eYOY   
#undef THIS_FILE P/%7kD@5;  
static char THIS_FILE[] = __FILE__; 6h 0qtXn-  
#endif F O!Td  
#define IDM_SHELL WM_USER+1 A*JOp8\)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4TtC~#D:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3I)~;>meo  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (gt\R}  
class CAboutDlg : public CDialog g4K+AK  
{ 'aSsyD!?<  
 public: L9b.D<  
  CAboutDlg(); u3T-U_:jSV  
  // Dialog Data ZmA}i`  
  //{{AFX_DATA(CAboutDlg) 1w,_D.1'  
  enum { IDD = IDD_ABOUTBOX }; c<lp<{;  
  //}}AFX_DATA RS5<] dy  
  // ClassWizard generated virtual function overrides 2Q^ q$@L  
  //{{AFX_VIRTUAL(CAboutDlg) i7x&[b  
 protected: uEPp%&D.+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support rQ*+ <`R}  
  //}}AFX_VIRTUAL L/k35x8  
  // Implementation c%&,(NJ]K  
 protected: g~lv/.CnA+  
  //{{AFX_MSG(CAboutDlg) "?"  :  
  //}}AFX_MSG ot0teNF  
  DECLARE_MESSAGE_MAP() hkK>h  
}; N$fP\h^AR  
'gwh:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (tK_(gO  
{ <)qa{,GX\  
 //{{AFX_DATA_INIT(CAboutDlg) <=(K'eqC^  
 //}}AFX_DATA_INIT 7 N}@zPAZ  
} 7Cz~nin>7  
HqGI.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ysaRH3M  
{ r~b.tpH  
 CDialog::DoDataExchange(pDX); a>4/2#J  
 //{{AFX_DATA_MAP(CAboutDlg) 6pt,]FlU  
 //}}AFX_DATA_MAP vNO&0~  
} B'Yx/c&n  
TTf j 5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NdK`-RT  
 //{{AFX_MSG_MAP(CAboutDlg) (,At5 T  
 // No message handlers w,%"+ tY_  
 //}}AFX_MSG_MAP ,NO[Piok  
END_MESSAGE_MAP()  f<o|5r  
35h|?eN_m!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) `?VK(<w0q  
: CDialog(CCaptureDlg::IDD, pParent) Gb')a/  
{ 9z,sn#-t  
 //{{AFX_DATA_INIT(CCaptureDlg) P`tOL#UeZL  
  m_bControl = FALSE; H_xHoCLI  
  m_bAlt = FALSE; c <TEA  
  m_bShift = FALSE; g#S X$k-O  
  m_Path = _T("c:\\"); E|=x+M1sH  
  m_Number = _T("0 picture captured."); gS(3m_  
  nCount=0; >+O0W)g{o  
  bRegistered=FALSE; '}cSBbl&/n  
  bTray=FALSE; :ez76oGyc  
 //}}AFX_DATA_INIT [R]V4Hb  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~d*Q{v~3  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); AD;m[u7  
} :Drf]D(sMX  
P~7(x7/7~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0\mf1{$"!7  
{ _Sjj|j  
 CDialog::DoDataExchange(pDX); vfSPgUB)  
 //{{AFX_DATA_MAP(CCaptureDlg) [Rj4= qq=  
  DDX_Control(pDX, IDC_KEY, m_Key); VL#:oyWA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); z,Xj$wl  
  DDX_Check(pDX, IDC_ALT, m_bAlt); I:dUHN+@L5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &A:&2sP8  
  DDX_Text(pDX, IDC_PATH, m_Path); f6r!3y  
  DDX_Text(pDX, IDC_NUMBER, m_Number); a1,)1y~  
 //}}AFX_DATA_MAP  ?K-4T  
} PKlR_#EB?  
1^_W[+<S/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >~g-  
//{{AFX_MSG_MAP(CCaptureDlg) %! ` %21  
 ON_WM_SYSCOMMAND() ,[n9DPZ  
 ON_WM_PAINT() )U/Kz1U  
 ON_WM_QUERYDRAGICON() L7ae6#5.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 5;`Ot2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kEh9J>|M  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  Wvb ~j  
//}}AFX_MSG_MAP Csyh 'v  
END_MESSAGE_MAP() 6;E3|st1X  
,Uh^e]pC  
BOOL CCaptureDlg::OnInitDialog() +9/K|SB{ $  
{ "8Dm7)nB  
 CDialog::OnInitDialog(); lz^Vi!|p  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); m%9Yo%l~  
 ASSERT(IDM_ABOUTBOX < 0xF000); _DR@P(0>_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^"Bhp:o2  
 if (pSysMenu != NULL) NSVE3  
 { " ILF!z  
  CString strAboutMenu; Y`g O:d8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $YJ 1P  
  if (!strAboutMenu.IsEmpty()) Mg >%EH/'  
  { P`rfDQoZ  
   pSysMenu->AppendMenu(MF_SEPARATOR); &D<6Go/)_*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >p&"X 2 @  
  } &5}YTKe}|  
 } JCH9~n.  
 SetIcon(m_hIcon, TRUE); // Set big icon UV(`.  
 SetIcon(m_hIcon, FALSE); // Set small icon x@ X2r  
 m_Key.SetCurSel(0); h<L_ =)lH  
 RegisterHotkey(); G 1{m"1M  
 CMenu* pMenu=GetSystemMenu(FALSE); wn"\ @QvG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 4EYD5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fAh|43Y*a  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); olv&K(-ccI  
 return TRUE; // return TRUE unless you set the focus to a control p$"~v A .  
} !S~)U{SSK  
D)MFii1J~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Q 1i5"'][  
{ ?C CQm  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) cO:lpsKYQ  
 { ;9~YQW@|  
  CAboutDlg dlgAbout; IAA_Ft  
  dlgAbout.DoModal(); F]RPM(!5O)  
 } tk0m[HN@eV  
 else JbEEI(Q>g  
 { ZQ"dAR/y  
  CDialog::OnSysCommand(nID, lParam); ; FI'nL  
 } HRTNIx  
} Qfp4}a=  
!bzWgD7j  
void CCaptureDlg::OnPaint() E2l" e?AN~  
{ e'~Qe_  
 if (IsIconic()) Uhu?G0>O  
 { |>P:R4P  
  CPaintDC dc(this); // device context for painting [ `|t(E'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /#5rt&q  
  // Center icon in client rectangle I!b"Rv=Nf-  
  int cxIcon = GetSystemMetrics(SM_CXICON); ju:}%'  
  int cyIcon = GetSystemMetrics(SM_CYICON); vEjf|-Mb9  
  CRect rect; )4o8SF7lz  
  GetClientRect(&rect); |`yU \  
  int x = (rect.Width() - cxIcon + 1) / 2; DK2Wjr;  
  int y = (rect.Height() - cyIcon + 1) / 2; b73}|4v  
  // Draw the icon S%H"i y  
  dc.DrawIcon(x, y, m_hIcon); &pY$\  
 } "r`2V-E  
 else c}v8j2{  
 { Sj)?!  
  CDialog::OnPaint(); _G`Q2hf"5  
 } =Crl{Ax  
} *56j'FX  
J_a2DM6d  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1/bTwzR.g  
{ &R/-~w5  
 return (HCURSOR) m_hIcon;  Jj%xLv%  
} F.(W`H*1+  
QlVj#Jv;~  
void CCaptureDlg::OnCancel() 3Ch42<  
{ rhYARr'  
 if(bTray) {Mo[C%  
  DeleteIcon(); nzO -\`40  
  CDialog::OnCancel(); Mg0ai6KD  
} f:nXE&X[  
Rxw+`ru  
void CCaptureDlg::OnAbout() (7_ezWSl>  
{ O*2{V]Y @  
 CAboutDlg dlg; )-XD= ]  
 dlg.DoModal(); s!W{ru  
} {y|.y~vW  
f% 8n?f3;u  
void CCaptureDlg::OnBrowse() JFu.o8[Q  
{ &~<i" W  
 CString str; P;7[5HFF  
 BROWSEINFO bi; od@!WjcM[8  
 char name[MAX_PATH]; R0w~ Z   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qU&v50n  
 bi.hwndOwner=GetSafeHwnd(); 8u*Q^-fpo0  
 bi.pszDisplayName=name; J>hjIN  
 bi.lpszTitle="Select folder"; e2xKo1?I  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )-6>!6hZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); SXXO#  
 if(idl==NULL) \HMuV g'Q  
  return; pcd?6jh8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?!tO'}?  
 str.ReleaseBuffer(); lh\`9F:  
 m_Path=str; uI)z4Z  
 if(str.GetAt(str.GetLength()-1)!='\\') 0m4#{^Y  
  m_Path+="\\"; l7WZ" 6d  
 UpdateData(FALSE); /w5c:BH  
} %}  
](+u'8  
void CCaptureDlg::SaveBmp() @Rd`/S@  
{ E)'T;%  
 CDC dc; u#ocx[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); '*U_!RmQ  
 CBitmap bm; _0&U'/cs  
 int Width=GetSystemMetrics(SM_CXSCREEN); #pD=TMefC  
 int Height=GetSystemMetrics(SM_CYSCREEN); .dc|?$XV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); hZ>1n&[ @  
 CDC tdc; ju.`c->k"  
 tdc.CreateCompatibleDC(&dc); j<?k$ 8H  
 CBitmap*pOld=tdc.SelectObject(&bm); 3E@ &  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ZSwhI@|  
 tdc.SelectObject(pOld); `)i4ZmE|  
 BITMAP btm; Pr/q?qZY  
 bm.GetBitmap(&btm); $?&distJ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !( _qM  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); r-hb]!t  
 BITMAPINFOHEADER bih; UHI<8o9  
 bih.biBitCount=btm.bmBitsPixel; 5uM`4xkj  
 bih.biClrImportant=0; vQ5rhRG)E  
 bih.biClrUsed=0; e{Mkwi+j  
 bih.biCompression=0; 5 yL"=3&+  
 bih.biHeight=btm.bmHeight; [ 7{cf`C  
 bih.biPlanes=1; ! 4 "$O@U4  
 bih.biSize=sizeof(BITMAPINFOHEADER); efyGjfoO  
 bih.biSizeImage=size; V' sq'XB  
 bih.biWidth=btm.bmWidth; SphP@J<ONW  
 bih.biXPelsPerMeter=0; w\JTMS$  
 bih.biYPelsPerMeter=0; &61h*s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rB =c  
 static int filecount=0; @Y%i`}T%(  
 CString name; p13y`sU=  
 name.Format("pict%04d.bmp",filecount++); :9|CpC`.  
 name=m_Path+name; L3S29-T  
 BITMAPFILEHEADER bfh; C7l4X8\w  
 bfh.bfReserved1=bfh.bfReserved2=0; }F_=.w0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); gp\o|igT  
 bfh.bfSize=54+size; Mn*v&O:  
 bfh.bfOffBits=54; :Q;mgHTNz  
 CFile bf; hC!8-uBK5<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m4c2WY6k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); wWJM./y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -+Ox/>k  
  bf.WriteHuge(lpData,size); ocj^mxh =O  
  bf.Close(); tY`%vI [  
  nCount++; S8e?-rC  
 } YB9)v5Nz(  
 GlobalFreePtr(lpData); kc[<5^b5  
 if(nCount==1) q$B|a5a?  
  m_Number.Format("%d picture captured.",nCount); pQCW6X  
 else _o6Zj1p  
  m_Number.Format("%d pictures captured.",nCount); ib(4Y%U6~  
  UpdateData(FALSE); 7] >z e  
} ~kZ? e1H  
a^)@ }4  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ZGS4P0$  
{ za5E{<0  
 if(pMsg -> message == WM_KEYDOWN) Q/l388'  
 { 0fw>/"v  
  if(pMsg -> wParam == VK_ESCAPE) Zx|VOl,;  
   return TRUE; E7U.>8C  
  if(pMsg -> wParam == VK_RETURN) xQs._YY  
   return TRUE; X<:Zx#J?i  
 } 7!g4`@!5M  
 return CDialog::PreTranslateMessage(pMsg); s&W^?eKr  
} XAUHF-"WE  
5Kkp1K$M  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5Noy~;  
{ 'DB'lP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~#:R1~rh\e  
  SaveBmp(); q:P44`Aq  
  return FALSE; rVb61$  
} }ho6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ]L!:/k,=S  
 CMenu pop; q!) nSD  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A{wSO./3  
 CMenu*pMenu=pop.GetSubMenu(0); 5eX+9niY  
 pMenu->SetDefaultItem(ID_EXITICON); _lZWy$rm%  
 CPoint pt; d?jzh 1  
 GetCursorPos(&pt); ^4 ~ V/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \x~},!l  
 if(id==ID_EXITICON) )VkH':yCM  
  DeleteIcon(); bx3kd+J7  
 else if(id==ID_EXIT) $_u)~O4$  
  OnCancel(); kXZG<?  
 return FALSE; }\.Z{h:t ?  
} RA:3ZV  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4nD U-P#f  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) CQET  
 AddIcon(); 82w=t  
 return res; $+w-r#,  
} fsV_>5I6  
*|.-y->  
void CCaptureDlg::AddIcon() a(K^/BT  
{ ]= 9^wS  
 NOTIFYICONDATA data; 6F?U:N#<  
 data.cbSize=sizeof(NOTIFYICONDATA); j7=x&)qbx  
 CString tip; ka| 8 _C^z  
 tip.LoadString(IDS_ICONTIP); w*IDL0#  
 data.hIcon=GetIcon(0); `j(-y`fo  
 data.hWnd=GetSafeHwnd(); uVLKR PY  
 strcpy(data.szTip,tip); LVNJlRK  
 data.uCallbackMessage=IDM_SHELL; Eh.NJI(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @l@erCw@  
 data.uID=98; +r 8/\'u-  
 Shell_NotifyIcon(NIM_ADD,&data); ?&$BQK  
 ShowWindow(SW_HIDE); e/y\P&"eI  
 bTray=TRUE; -e_L2<7  
} Mzj|57:gx  
"S0WFP\P+  
void CCaptureDlg::DeleteIcon() Tf.DFfV#y  
{ Yi#U~ h  
 NOTIFYICONDATA data; FSkz[D_}  
 data.cbSize=sizeof(NOTIFYICONDATA); McRfEF \  
 data.hWnd=GetSafeHwnd(); ~|=goHmm[  
 data.uID=98; @x/D8HK2  
 Shell_NotifyIcon(NIM_DELETE,&data); wT^QO^.  
 ShowWindow(SW_SHOW); S,^)\=v  
 SetForegroundWindow(); hH=}<@z   
 ShowWindow(SW_SHOWNORMAL); qku!Mg  
 bTray=FALSE; {Nny .@P)H  
} 8G|kKpX  
gwv s  
void CCaptureDlg::OnChange() Y #6G&)M  
{ vC%8-;8{H  
 RegisterHotkey(); N&-J,p~  
} hBNA,e:  
}:4b_-&Q5  
BOOL CCaptureDlg::RegisterHotkey() ^n<o,K4\}  
{ N Uo   
 UpdateData(); SR*KZ1U  
 UCHAR mask=0; U|)CZcM  
 UCHAR key=0; _Rm1-,3  
 if(m_bControl) GGkU$qp2~  
  mask|=4; i>=!6Hu2  
 if(m_bAlt) 05/'qf7P,U  
  mask|=2; E@92hB4D"  
 if(m_bShift) z3Q#Wmv2  
  mask|=1;  @1O.;  
  key=Key_Table[m_Key.GetCurSel()]; 45$F cK  
 if(bRegistered){ b=Oec%Adx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }ujl2uhM  
  bRegistered=FALSE; _jD\kg#LY  
 } ctu`FQ  
 cMask=mask; [W*Q~Wvp  
 cKey=key; f,'9Bj. ~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1_6oM/?'  
 return bRegistered; [mA\,ny9  
} y#)ad\  
?S~j2 J]  
  四、小结 db5@+_  
)|`|Usn#[  
  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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