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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: `Frr?.3&-  
  VaW^;d#  
  一、实现方法 @#p6C  
8B(=Y;w  
  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: P6I<M}p  
l>?f+70  
#pragma data_seg("shareddata") R/xT.EQ(N  
HHOOK hHook =NULL; //钩子句柄 zM(-f|wVI)  
UINT nHookCount =0; //挂接的程序数目 BM{*5Lf  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 drxCjuz"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >"+ ho  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey gZ| !'  
static int KeyCount =0; |[0Ijm2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 NcrBp(  
#pragma data_seg() kL F~^/  
o`Af6C;Q  
  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。 NM9,AG  
BCuoFw)  
  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: {b'  
UpPl-jeT  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BaWU[*  
cKey,UCHAR cMask) % H<@Y$r  
{ P+Gz'  
 BOOL bAdded=FALSE; @^<&LG5^  
 for(int index=0;index<MAX_KEY;index++){ tZv^uuEp3  
  if(hCallWnd[index]==0){ X`3_ yeQc  
   hCallWnd[index]=hWnd; 6oq5CDoq  
   HotKey[index]=cKey; ~;z] _`_Va  
   HotKeyMask[index]=cMask; "TP~TjXfq  
   bAdded=TRUE; (?g+.]Dt,  
   KeyCount++; 1KY0hAx  
   break; lU%oU&P/"S  
  } Qv`: E   
 } q7r b3d  
 return bAdded; en/h`h]h  
} jo0XF]  
//删除热键 pY[b[ezb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $P#x>#+[A  
{ _BY+Tfol  
 BOOL bRemoved=FALSE; # S/n3  
 for(int index=0;index<MAX_KEY;index++){ 'sXrtl7{^  
  if(hCallWnd[index]==hWnd){ g4Q' Fub+I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B'Jf&v  
    hCallWnd[index]=NULL; EADN   
    HotKey[index]=0; ul~6zBKO   
    HotKeyMask[index]=0; `d^Q!QxE  
    bRemoved=TRUE; {]cr.y]\  
    KeyCount--; :4-,Ru1C"  
    break; uY(8KW  
   } ,Jh#$mil  
  } 3[y$$qXI  
 } \+nV~Pi"A  
 return bRemoved; ~Kt1%&3{a?  
} *r[V[9+y-D  
SD:D8"8  
i-w$-2w  
  DLL中的钩子函数如下: vb?.`B_>&  
T9%|B9FeJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) .)$MZyo  
{ (&Jo. <  
 BOOL bProcessed=FALSE; NN2mOJ:-  
 if(HC_ACTION==nCode) .D ^~!A  
 { AX$r,KmE  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {|hg3R~A  
   switch(wParam) 9Q}g Vqn  
   {  akt7rnt?i  
    case VK_MENU: yyljyE  
     MaskBits&=~ALTBIT; lct  
     break; o+}k$i!6  
    case VK_CONTROL: ~tt\^:\3~S  
     MaskBits&=~CTRLBIT; $A9Pi"/*z  
     break; HUD0 @HQI  
    case VK_SHIFT: D-LOjMe  
     MaskBits&=~SHIFTBIT; jk&xzJH.  
     break; RZV6;=/  
    default: //judge the key and send message u>.a;BO  
     break; _qf39fM;\  
   } ,lA @C2 c  
   for(int index=0;index<MAX_KEY;index++){ #:0-t!<0C  
    if(hCallWnd[index]==NULL) X*@ tp,t  
     continue; o ?vGI=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AK,'KO%{=  
    { r!dWI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~`QoBZ.O&  
     bProcessed=TRUE; PIa!N Py  
    } vE'{?C=EM  
   } (1[59<cg]  
  } z/xPI)R[  
  else if((lParam&0xc000ffff)==1){ //有键按下 GnW MI1$  
   switch(wParam) ceE]^X;p  
   { g ass Od  
    case VK_MENU: lP`BKc,  
     MaskBits|=ALTBIT; =/46;844T  
     break; ').) 0;  
    case VK_CONTROL: }q@#M8b  
     MaskBits|=CTRLBIT; |K Rt$t  
     break; ;\2Z?Kq  
    case VK_SHIFT: dREY m}1  
     MaskBits|=SHIFTBIT; 2L1 ,;  
     break; ft(o-f7,  
    default: //judge the key and send message Pn OWQ8=  
     break; 4)8VmCW  
   } %r(WS_%K|  
   for(int index=0;index<MAX_KEY;index++){ {IV% _y?  
    if(hCallWnd[index]==NULL) ulIEx~qP  
     continue; 6EyPZ{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s/IsrcfM  
    { '1ySBl1>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NgGMsE\C}  
     bProcessed=TRUE; /VT/KT{  
    } YkWHI (p  
   } lfc&#G i3  
  } 2r!ltG3}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i)z|= |?  
   for(int index=0;index<MAX_KEY;index++){ &su'znLV  
    if(hCallWnd[index]==NULL) EYq?NL='  
     continue; ,O5X80'.g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hHE~/U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f?sm~PwC-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `sCaGCp  
   } c,2& -T}  
  } YK3>M"58  
 } Kt_oo[ey{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :'Qiwf&  
} ux&"TkEp  
JkAM:,^(  
  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: uPz+*4+  
QPx5`{nN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I$xZV?d.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tbRW6  
c 3QgX4vq  
  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: Z ;.-UXat  
|NfFe*q0;8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =*,SD  
{ %PYl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r.H`3m.0q  
 { .zO2g8(VR  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a+^` +p/5  
  SaveBmp(); S:_Ms{S  
  return FALSE; %F>~2g?$  
 } S 5S\zTPIf  
 …… //其它处理及默认处理 Kq")\Ha,f  
} !!1?2ine  
*DF3juf~  
)5Khl"6!z  
  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。 JY0aE  
RPz[3y  
  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。 !/is+ xp  
9jkz83/+<  
  二、编程步骤 ZLkl:'E_  
I a&*JYM[  
  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"; } e[ E  
}\"EI<$s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; '$tCAS  
Ww]$zd-bo  
  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; rQjk   
7OV^>"S  
  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; RaJTya^  
CY1WT  
  5、 添加代码,编译运行程序。 yE$PLM  
`fBQ?[05.  
三、程序代码 \<LCp;- K  
\QvGkcDc{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL uC'-: t#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !7N:cx'Qy  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ l;; 2\mL?  
#if _MSC_VER > 1000 DSrU7#  
#pragma once Y+?QHtZL  
#endif // _MSC_VER > 1000 8Y`Lq$u  
#ifndef __AFXWIN_H__ dfDjOZSL  
#error include 'stdafx.h' before including this file for PCH &tyS6S+  
#endif /UCBoQ$/]  
#include "resource.h" // main symbols E)v~kC}7.  
class CHookApp : public CWinApp _{*} )&!M  
{ 5GsmBf$RUb  
 public: }LUvh  
  CHookApp(); d<m;Q}/l&h  
  // Overrides Za|7gt];l  
  // ClassWizard generated virtual function overrides V}E['fzBFV  
  //{{AFX_VIRTUAL(CHookApp) "#d$$ 8  
 public: i fsh(^N  
  virtual BOOL InitInstance(); km %r{  
  virtual int ExitInstance(); )PYPlSQ*V  
  //}}AFX_VIRTUAL AiqKf=  
  //{{AFX_MSG(CHookApp) A(y6]E!  
  // NOTE - the ClassWizard will add and remove member functions here. XcJ5KTn  
  // DO NOT EDIT what you see in these blocks of generated code ! K; #FU  
  //}}AFX_MSG e{)giJY9  
  DECLARE_MESSAGE_MAP() i$Y#7^l%k  
}; l)u%`Hcn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); lu#a.41  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); t^#1=nK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x;mw?B[  
BOOL InitHotkey(); e,(Vy  
BOOL UnInit(); > X~\(|EM  
#endif }<Ydj .85  
Kzev] er  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]3,'U(!+  
#include "stdafx.h" Es=G' au  
#include "hook.h" bb_elmb)n  
#include <windowsx.h> *l7 `C)  
#ifdef _DEBUG x?i wtZ@  
#define new DEBUG_NEW Y.m1d?H 1  
#undef THIS_FILE "im5Fnu  
static char THIS_FILE[] = __FILE__; 4M C]s~n  
#endif @]Q4K%1^"  
#define MAX_KEY 100 o$ @/@r  
#define CTRLBIT 0x04 M6-uTmN:d  
#define ALTBIT 0x02 +w0Wg.4V  
#define SHIFTBIT 0x01 8@3=SO  
#pragma data_seg("shareddata") tB;PGk_6  
HHOOK hHook =NULL; r\m{;Z#LJm  
UINT nHookCount =0; ~}OaX+!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $1=7^v[U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c&;" Y{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 7FwtBO  
static int KeyCount =0; yzEyOz@Q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fw%p_Cm  
#pragma data_seg() ZK4V-?/[6  
HINSTANCE hins; g}~s"Sz  
void VerifyWindow(); *)[fGxz \  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5bb#{?2i  
//{{AFX_MSG_MAP(CHookApp) \O*ZW7?TJ  
// NOTE - the ClassWizard will add and remove mapping macros here. \J:+Wl.9A  
// DO NOT EDIT what you see in these blocks of generated code! $NCvF'  
//}}AFX_MSG_MAP bWL!=  
END_MESSAGE_MAP() Gza= 0  
1F.._5_"]  
CHookApp::CHookApp() Rd8mn'A  
{ :V(C+bm *  
 // TODO: add construction code here, GUL~k@:_k  
 // Place all significant initialization in InitInstance i, ^-9  
} YusmMsN?  
:%sG'_d  
CHookApp theApp; x)80:A}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5kqI  
{ {X?Aj >l  
 BOOL bProcessed=FALSE; Z +/3rd  
 if(HC_ACTION==nCode) 5 CnNp?.t^  
 { l&\y]ZV={  
  if((lParam&0xc0000000)==0xc0000000){// Key up JQb{?C  
   switch(wParam) N-N]BS6  
   { B\D)21Ik}%  
    case VK_MENU: P^o@x,V!&  
     MaskBits&=~ALTBIT; >~d'i  
     break; [vI ;A !  
    case VK_CONTROL: *v#V%_o  
     MaskBits&=~CTRLBIT; )h ,v(Rxa  
     break; NvzPZ9=@-  
    case VK_SHIFT: ="G2I\  
     MaskBits&=~SHIFTBIT; Y4YZM  
     break; FVNTE +LW  
    default: //judge the key and send message a2?@OJ  
     break; ;Q3[} ]su  
   } o5/BE`VD5c  
   for(int index=0;index<MAX_KEY;index++){ V+D<626o  
    if(hCallWnd[index]==NULL) C}9GrIi  
     continue; h@JX?LzZS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XX-(>B0L  
    { /IcGJ&;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :tbI=NDb  
     bProcessed=TRUE; yC ?p,Ci,  
    } 7"Nda3  
   } eSIG+{;&  
  } FD!8o  
  else if((lParam&0xc000ffff)==1){ //Key down #Fo#f<b p  
   switch(wParam) P cbhylKd  
   { D,*|:i  
    case VK_MENU: f5M;q;  
     MaskBits|=ALTBIT; nN.Gn+Cl  
     break; )AEtW[~D  
    case VK_CONTROL: W4.w  
     MaskBits|=CTRLBIT; 4cy,'B  
     break; byP<!p*  
    case VK_SHIFT: %Unwh1VG  
     MaskBits|=SHIFTBIT; bD/ZKvg  
     break; B T}l"  
    default: //judge the key and send message tf54EIy5Y  
     break; |d~'X%b%  
   } \ ^pc"?Rc  
   for(int index=0;index<MAX_KEY;index++) / j "}e_Q  
   { mc`Z;D/mt  
    if(hCallWnd[index]==NULL) JXRU9`3)A  
     continue;  mVS^HQ:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Yx,E5}-  
    { FS)# v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T9J&^I  
     bProcessed=TRUE; &=S:I!9;;  
    } $;(@0UDE  
   } ]iW:YNvXA  
  } LRWM}'.s  
  if(!bProcessed){ |Wa.W0A  
   for(int index=0;index<MAX_KEY;index++){  %nUN  
    if(hCallWnd[index]==NULL) *@^@7`W  
     continue; }'}n~cA.{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |RD )pvVM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "uL~D5!f  
   } vP#*if[V5  
  } wjH1Ombt  
 } 7. $wK.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H)S!%(x4  
} $8(QBZq  
cR!M{U.q  
BOOL InitHotkey() a-S tOO5s  
{ IS!OO<  
 if(hHook!=NULL){ }:0ru_F)(4  
  nHookCount++; p-\->_9)y`  
  return TRUE; 31 <0Nw;l  
 } f|_\GVW  
 else F_-xp1|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); nql9SQ'\\  
  if(hHook!=NULL) w oIZFus  
   nHookCount++; =Yl ea,S  
  return (hHook!=NULL); N.q*jY= X|  
} ;ow)N <Z  
BOOL UnInit() d^M*%az  
{ \1<|X].jNY  
 if(nHookCount>1){ R{Zd ]HT  
  nHookCount--; PCL ;Z  
  return TRUE; }ssja,;  
 } W 2[]m>;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^$% Sg//  
 if(unhooked==TRUE){ R@pY+d9qp  
  nHookCount=0; <FU?^*~  
  hHook=NULL; k]$oir  
 } O9>$(`@I  
 return unhooked; >EFWevT{  
} w1-P6cf  
;ltk}hJ]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _A!Fp0}`  
{ Z|x|8 !D  
 BOOL bAdded=FALSE; &wY$G! P  
 for(int index=0;index<MAX_KEY;index++){ R3a}YwJFXF  
  if(hCallWnd[index]==0){ ZQfPDH=  
   hCallWnd[index]=hWnd; #O;JV}y  
   HotKey[index]=cKey; (57!{[J  
   HotKeyMask[index]=cMask; 1,;zX^  
   bAdded=TRUE; pw4^E|X  
   KeyCount++; =+wd"Bu  
   break; *IWW,@0  
  } [(3s5)O  
 } 2yg6hR  
 return bAdded; $57b.+2n  
} _9 '_w&  
-j]k^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x,U_x  
{ LOi}\O8  
 BOOL bRemoved=FALSE; <nqv)g"u0  
 for(int index=0;index<MAX_KEY;index++){ ~I+MuI[  
  if(hCallWnd[index]==hWnd){ TE+>|}]R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G'G8`1Nj  
    hCallWnd[index]=NULL; aif;h! ?y  
    HotKey[index]=0; D%yY&q;  
    HotKeyMask[index]=0; uz{RV_IX7  
    bRemoved=TRUE; 7>j~;p{  
    KeyCount--; kq5X<'MM9N  
    break; _7;:*'>a4  
   } 1 rhZlmf[r  
  } KB](W  
 } m?<E >-bI  
 return bRemoved; / 'qoKof  
} 6^'BTd  
thJ~* 0^  
void VerifyWindow() R'tKJ_VI  
{ .nrllVG%`  
 for(int i=0;i<MAX_KEY;i++){ eyyME c!  
  if(hCallWnd!=NULL){ gd*Gn"  
   if(!IsWindow(hCallWnd)){ *l+Dbm,u  
    hCallWnd=NULL; l^Rb%?4Z  
    HotKey=0; ,.W7Z~z  
    HotKeyMask=0; P Y^#hC5:  
    KeyCount--; -<6?ISF2  
   } <R /\nYXz  
  } bu]"?bc  
 } [ncK+rGAc  
} , [|aWT%9  
be,Rj,-  
BOOL CHookApp::InitInstance() }<0N)dpT  
{ ]oB~8d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Eu`|8# [ W  
 hins=AfxGetInstanceHandle(); ]A3  
 InitHotkey(); rKrHd  
 return CWinApp::InitInstance(); e(? w h   
} c;$ 4}U4  
!=YKfzE  
int CHookApp::ExitInstance() _VK I@   
{ A#=TR_@:  
 VerifyWindow(); IA@>'O  
 UnInit(); XnQR(r)pR2  
 return CWinApp::ExitInstance(); E&P2E3P  
} -d\sKc  
i3,IEN  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #s\@fp7A  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) @b,Az{EH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VLez<Id9(  
#if _MSC_VER > 1000 sE pI)9  
#pragma once qSc-V`*  
#endif // _MSC_VER > 1000 SeD}H=,@  
^viabkf C  
class CCaptureDlg : public CDialog l;lrf3  
{ \wK&wRn)  
 // Construction <&3P\aM>  
 public: !bE-&c  
  BOOL bTray; ]4l2jY  
  BOOL bRegistered; %f;dn<m=c  
  BOOL RegisterHotkey(); zt(lV  
  UCHAR cKey; f+h\RE=BGt  
  UCHAR cMask; : {p'U2  
  void DeleteIcon(); @NLcO}  
  void AddIcon(); QqA=QTZ}  
  UINT nCount; ~3F'X  
  void SaveBmp(); .[Sis<A]%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor VeYT[Us"  
  // Dialog Data n)e2?  
  //{{AFX_DATA(CCaptureDlg) O3} JOv_  
  enum { IDD = IDD_CAPTURE_DIALOG }; ?=? _32O  
  CComboBox m_Key; yLnQ9BXB&  
  BOOL m_bControl; qjB:6Jq4q  
  BOOL m_bAlt; 4&}%GH>}  
  BOOL m_bShift; ZL( j5E  
  CString m_Path; ]r Uj<[O  
  CString m_Number; -S'KxC  
  //}}AFX_DATA @/ z\p7e  
  // ClassWizard generated virtual function overrides aM}9ZurI  
  //{{AFX_VIRTUAL(CCaptureDlg) B9maz"lJ  
 public: [,o:nry'a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +\eJxyO  
 protected: _~<sb,W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z`Y&cKsn  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e\%,\ uV}  
  //}}AFX_VIRTUAL }"D;?$R!  
  // Implementation "q=Cye  
 protected: uo#1^`P  
  HICON m_hIcon; 'nCVjO7o  
  // Generated message map functions ,mHME~  
  //{{AFX_MSG(CCaptureDlg) $}9jv3>)  
  virtual BOOL OnInitDialog(); Xw?DN*`L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9&lemz  
  afx_msg void OnPaint(); vpQ&vJfR  
  afx_msg HCURSOR OnQueryDragIcon(); {L-^J`> G  
  virtual void OnCancel(); #l=yD]t PU  
  afx_msg void OnAbout(); pY31qhoZ.  
  afx_msg void OnBrowse(); /<rvaR  
  afx_msg void OnChange(); 2W,9HSu8  
 //}}AFX_MSG Pb5yz-?  
 DECLARE_MESSAGE_MAP() k@4N7}  
}; ~; 9HGtg  
#endif s<I)THC  
PLCm\Oh$l  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %_(vSpk  
#include "stdafx.h" 6,>$Jzs)5E  
#include "Capture.h" ^ZwZze:2  
#include "CaptureDlg.h" \<7Bx[/D4  
#include <windowsx.h> x[0T$  
#pragma comment(lib,"hook.lib") *u},(4Qf  
#ifdef _DEBUG wC1pfXa  
#define new DEBUG_NEW )U&9d  
#undef THIS_FILE Rl?1|$%  
static char THIS_FILE[] = __FILE__; V(';2[)  
#endif L!}!k N:?  
#define IDM_SHELL WM_USER+1 *:%&z?<Fw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iLy^U*yK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #(^<qr   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vjEDd`jYZ  
class CAboutDlg : public CDialog wm5&5F4:  
{ XZE(& (s  
 public: s)-An( Uw  
  CAboutDlg(); ,GSiSn  
  // Dialog Data JwG(WLb:  
  //{{AFX_DATA(CAboutDlg) %1?t)Bg  
  enum { IDD = IDD_ABOUTBOX }; "~4V(  
  //}}AFX_DATA @Jd&[T27Lr  
  // ClassWizard generated virtual function overrides l2F#^=tp  
  //{{AFX_VIRTUAL(CAboutDlg) SU0SsgFB  
 protected: -.D?Z8e  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a\P:jgF  
  //}}AFX_VIRTUAL .j4y0dh33  
  // Implementation Ed=/w6<  
 protected: a%%7Ew ?  
  //{{AFX_MSG(CAboutDlg) tA(oD4H9  
  //}}AFX_MSG '\bokwsP  
  DECLARE_MESSAGE_MAP() E@ea ?Sx  
}; ZF>:m>  
Wl| i$L)7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m` 1dB%;?  
{ A7L;ims7  
 //{{AFX_DATA_INIT(CAboutDlg) 8m0*89HEu  
 //}}AFX_DATA_INIT f ,e]jw@  
} =M1}HF,7>l  
utck{]P  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GCl *x:  
{ c7CYulm  
 CDialog::DoDataExchange(pDX); k$$SbStD  
 //{{AFX_DATA_MAP(CAboutDlg) &eMd^l}:#  
 //}}AFX_DATA_MAP !oH{=.w  
} .@{v{  
4)iP%%JH  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Zh8\B)0unn  
 //{{AFX_MSG_MAP(CAboutDlg) `:&RB4Z  
 // No message handlers q^xG%YdPz+  
 //}}AFX_MSG_MAP V Rv4p5  
END_MESSAGE_MAP() ULK] ' Rn  
@|A!?}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nmpc<&<<  
: CDialog(CCaptureDlg::IDD, pParent) pCt2 -aam  
{ jU-LT8y:  
 //{{AFX_DATA_INIT(CCaptureDlg) /Xi21W/  
  m_bControl = FALSE; .u mqyU~  
  m_bAlt = FALSE; x<I[?GT=  
  m_bShift = FALSE; p@pb[Bx~[  
  m_Path = _T("c:\\"); dOv\]  
  m_Number = _T("0 picture captured."); du$lS':`  
  nCount=0; QtfL'su:  
  bRegistered=FALSE; Ucv7`W gr  
  bTray=FALSE; Sfe[z=7S  
 //}}AFX_DATA_INIT y],op G6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c&PsT4Wh  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); cn}15JHdR  
} PxYK)n9&  
Tu-lc)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }`CF(Do  
{ EY]H*WJJ  
 CDialog::DoDataExchange(pDX); z uNm !$  
 //{{AFX_DATA_MAP(CCaptureDlg) SE*;6&yL  
  DDX_Control(pDX, IDC_KEY, m_Key); mh4 VQ9  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xD*Zcw(vj~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L4^/O29  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); rOOo42Y W`  
  DDX_Text(pDX, IDC_PATH, m_Path); 8(j]=n6 r  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ch{6=k bK  
 //}}AFX_DATA_MAP Kz b-a$  
} <e#v9=}DI  
-W6@[5c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iZk4KX  
//{{AFX_MSG_MAP(CCaptureDlg) m> +  
 ON_WM_SYSCOMMAND() F3V:B.C  
 ON_WM_PAINT() I]n X6=j5  
 ON_WM_QUERYDRAGICON() >!Gq[i0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .oM- A\!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) < e3] pM  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Q.9,W=<6  
//}}AFX_MSG_MAP Ur 1k3  
END_MESSAGE_MAP() }WJX Q@  
ax5n}  
BOOL CCaptureDlg::OnInitDialog() lI46 f  
{ =W2.Nc  
 CDialog::OnInitDialog(); Zbl*U(KU?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =P,mix|  
 ASSERT(IDM_ABOUTBOX < 0xF000); :$VGqvO12W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); +Y*4/w[   
 if (pSysMenu != NULL) ~*1Z1aZ  
 { SeZ+&d  
  CString strAboutMenu; fFVQu\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l9/}fMi  
  if (!strAboutMenu.IsEmpty())  %o/@0.w  
  { +z9BWo!{I  
   pSysMenu->AppendMenu(MF_SEPARATOR); dH0>lV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); qPi $kecx  
  } >=rniHs=?7  
 } ~YNzSkz  
 SetIcon(m_hIcon, TRUE); // Set big icon A##Q>|>)  
 SetIcon(m_hIcon, FALSE); // Set small icon :9 &@/{W  
 m_Key.SetCurSel(0); i:N-Q)<Q*)  
 RegisterHotkey(); ph)=:*A6&  
 CMenu* pMenu=GetSystemMenu(FALSE); Y&M{7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 5Th\wTh04  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;[lLFI  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }x{1{Bw>Y  
 return TRUE; // return TRUE unless you set the focus to a control 6}@T^?  
} gzK/l:  
Ts, U T L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [GM!@6U  
{ ~K)FuL[*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) CNj |vYj  
 { ]ml'd  
  CAboutDlg dlgAbout; >f9Q&c$R  
  dlgAbout.DoModal(); =.J>'9Q  
 } VAheus  
 else = ?/6hB=7<  
 { _;x`6LM  
  CDialog::OnSysCommand(nID, lParam); +yr~UP_ }  
 } ;eFV}DWW  
} Ir` l*:j$  
.1h\r, #  
void CCaptureDlg::OnPaint() ]9<H[5>$R  
{ Vl(id_~_  
 if (IsIconic()) u,@ac[!vP  
 { 7 mA3&<&q  
  CPaintDC dc(this); // device context for painting S=L#8CID  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >)[W7h  
  // Center icon in client rectangle x `%x f  
  int cxIcon = GetSystemMetrics(SM_CXICON); <|3F('Q"  
  int cyIcon = GetSystemMetrics(SM_CYICON); KB\ri&bF  
  CRect rect; otdv;xI9  
  GetClientRect(&rect); GAR6nJCz  
  int x = (rect.Width() - cxIcon + 1) / 2; +U1fa9NSn  
  int y = (rect.Height() - cyIcon + 1) / 2; CJ3/8*;w  
  // Draw the icon ~T._ v;IT  
  dc.DrawIcon(x, y, m_hIcon); iF:NDqc  
 } /K,@{__JP  
 else PJKxh%J  
 { 0|\JbM  
  CDialog::OnPaint(); ;]BNc"  
 } Vn^8nS  
} ~4S6c=:  
@nj`T{*.  
HCURSOR CCaptureDlg::OnQueryDragIcon() (/P-9<"U  
{ 1ww~!R  
 return (HCURSOR) m_hIcon; Pi[(xD8  
} z)&&Ym#  
x}7Xd P.2$  
void CCaptureDlg::OnCancel() rqM_#[Y?  
{ $yZP"AsAR  
 if(bTray) f*[Uq0?  
  DeleteIcon(); BQ~\p\  
  CDialog::OnCancel(); K+U0YMRmz  
} i+Xb3+R  
\D! I"mr  
void CCaptureDlg::OnAbout() i:^ 8zW  
{ nlx~yUXL4  
 CAboutDlg dlg; qS[nf>"  
 dlg.DoModal(); 6)3pnhG9  
} 'p,54<e  
\/ /{\d  
void CCaptureDlg::OnBrowse() 4Cf.%f9@  
{ Nu%MXu+  
 CString str; mLeK7?GL  
 BROWSEINFO bi; u,Cf4H*xS  
 char name[MAX_PATH]; 9C1\?)"D^e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )G|'PXI@,  
 bi.hwndOwner=GetSafeHwnd(); :AC(  \  
 bi.pszDisplayName=name;  !*-|s}e  
 bi.lpszTitle="Select folder"; gs=(h*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %t,Fxj4F  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }$'T=ay&  
 if(idl==NULL) E"Y[k8-:2/  
  return; SfwNNX%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?xCWg.#l4V  
 str.ReleaseBuffer(); +C[%^G-:  
 m_Path=str; +zsB~Vz  
 if(str.GetAt(str.GetLength()-1)!='\\') (, uW-  
  m_Path+="\\"; IaR D"oCH  
 UpdateData(FALSE); ,A!0:+  
} )ocr.wU@  
H}}C>p"!,  
void CCaptureDlg::SaveBmp() b(:U]>J  
{ |`ZW(} ~  
 CDC dc; !&vPG>V  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eq$.np  
 CBitmap bm; #?RT$L>n  
 int Width=GetSystemMetrics(SM_CXSCREEN); QetyuhS~  
 int Height=GetSystemMetrics(SM_CYSCREEN); :0j_I\L  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~~3 BV,  
 CDC tdc; Q)\4  .d  
 tdc.CreateCompatibleDC(&dc); Ex}hk!  
 CBitmap*pOld=tdc.SelectObject(&bm); '/QS sZR  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YS+|n%?  
 tdc.SelectObject(pOld); qO}Q4a+  
 BITMAP btm; tsN,yI]-VA  
 bm.GetBitmap(&btm); &O.lIj#F R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |t uh/e@dx  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jLv8K  
 BITMAPINFOHEADER bih; aLt2fB1)  
 bih.biBitCount=btm.bmBitsPixel; C0%yGLh&  
 bih.biClrImportant=0; 'yR)z\)  
 bih.biClrUsed=0; 3DS&-rN  
 bih.biCompression=0; BXB ZX@jVk  
 bih.biHeight=btm.bmHeight; :"I!$_E'  
 bih.biPlanes=1; cMp#_\B  
 bih.biSize=sizeof(BITMAPINFOHEADER); |kh7F0';"  
 bih.biSizeImage=size; %{;1i  
 bih.biWidth=btm.bmWidth; B 42t  
 bih.biXPelsPerMeter=0; .I nDyKt  
 bih.biYPelsPerMeter=0; oA]rwa UX  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 20A`]-D  
 static int filecount=0; }*s`R;B|,  
 CString name; G#nZ%qQ:I  
 name.Format("pict%04d.bmp",filecount++); ?]PE!7H  
 name=m_Path+name; ~Y/o9x0  
 BITMAPFILEHEADER bfh; db`L0JB  
 bfh.bfReserved1=bfh.bfReserved2=0;  jWqjGX`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p;n"zr8U  
 bfh.bfSize=54+size; +Fa!<txn  
 bfh.bfOffBits=54; (rm*KD"]  
 CFile bf; 1V:I }~\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S^T ><C  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z|$M 9E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7oV$TAAf  
  bf.WriteHuge(lpData,size); &hu>yH>j  
  bf.Close(); Xli$4 uL   
  nCount++; liU8OXBl  
 } 7-#   
 GlobalFreePtr(lpData); y,s`[=CT  
 if(nCount==1) ???`BF[|  
  m_Number.Format("%d picture captured.",nCount); ?!HU$>  
 else a]nK!;>$  
  m_Number.Format("%d pictures captured.",nCount); @L?KcGD  
  UpdateData(FALSE); 7BkY0_KK  
} RG_.0'5=hc  
I>JBGR`j  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) F<TIZ^gFP  
{ #ADm^UT^  
 if(pMsg -> message == WM_KEYDOWN) vb`R+y@  
 { Ake@krh>$  
  if(pMsg -> wParam == VK_ESCAPE) SNtk1pG>  
   return TRUE; 5D eo}(3  
  if(pMsg -> wParam == VK_RETURN) ez<V  
   return TRUE; 2"6bz^>}  
 } ]Bj2;<@y  
 return CDialog::PreTranslateMessage(pMsg); LS]0p#  
} E.N  
$Da?)Hz'F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y #zO1Nig`  
{ Z5|BwM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ );;UA6CD  
  SaveBmp(); T:Nc^QP|tm  
  return FALSE; T/]f5/  
} .tcdqL-'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nO+R >8,Q  
 CMenu pop; Jb*E6-9G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rld8hFj  
 CMenu*pMenu=pop.GetSubMenu(0); VYjt/\ Z  
 pMenu->SetDefaultItem(ID_EXITICON); Xz`0nU  
 CPoint pt; nvQTJ4,,  
 GetCursorPos(&pt); h8dFW"cpC  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Swr4De_5  
 if(id==ID_EXITICON) 3 3zE5vr  
  DeleteIcon(); h:RP/ 0E  
 else if(id==ID_EXIT) }i{A4f `  
  OnCancel(); <*(^QOM  
 return FALSE; LUdXAi"f  
} 6n^@Ps  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); RdBIbm  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u4j"U6"]M  
 AddIcon(); Y>6N2&Q  
 return res; )2a)$qx;  
} ]I_*+^?tI  
S$ffTdRz  
void CCaptureDlg::AddIcon() :V1j*)  
{ tI)|y?q  
 NOTIFYICONDATA data; _n1[(I  
 data.cbSize=sizeof(NOTIFYICONDATA); 'o~gT ;T#  
 CString tip; (x fN=Te,-  
 tip.LoadString(IDS_ICONTIP); t)1`^W}  
 data.hIcon=GetIcon(0); %&S9~E D  
 data.hWnd=GetSafeHwnd(); 2VzYP~Jg  
 strcpy(data.szTip,tip); >, [@SF%  
 data.uCallbackMessage=IDM_SHELL; ^t:dcY7  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2RQ- L  
 data.uID=98; d6W\ \6V  
 Shell_NotifyIcon(NIM_ADD,&data); P ^ 4 @  
 ShowWindow(SW_HIDE); A=3L_ #nO  
 bTray=TRUE; :bm%f%gg  
} vA}_x7}n(  
l0C`teO  
void CCaptureDlg::DeleteIcon() SL-;h#-y 4  
{ PD&gC88  
 NOTIFYICONDATA data; hHHQmK<r  
 data.cbSize=sizeof(NOTIFYICONDATA); axpZ`BUc  
 data.hWnd=GetSafeHwnd(); 3~VV2O  
 data.uID=98; bF6J>&]!  
 Shell_NotifyIcon(NIM_DELETE,&data); }wkY`"  
 ShowWindow(SW_SHOW); <v'&Pk<  
 SetForegroundWindow(); )U=]HpuzI  
 ShowWindow(SW_SHOWNORMAL); sM+~x<}0  
 bTray=FALSE; H8B$# .  
} z:4_f:70  
{ :1X N  
void CCaptureDlg::OnChange() ?w+ V:D  
{ \5 rJ  
 RegisterHotkey(); M~N/er  
} SnR2o3r-Of  
U (#JC(E-#  
BOOL CCaptureDlg::RegisterHotkey() iGkysU<wcp  
{ 7f4O~4.[i  
 UpdateData(); :eSsqt9]9  
 UCHAR mask=0; &7oL2 Wf  
 UCHAR key=0; 7[w<v(Rc  
 if(m_bControl) vFB^h1k~.M  
  mask|=4; ZP5 !O[Ut  
 if(m_bAlt) IzJq:G.  
  mask|=2; B0%=! &  
 if(m_bShift) 9 h?'zyX B  
  mask|=1; > (9\ cF{  
  key=Key_Table[m_Key.GetCurSel()]; g4 eW<  
 if(bRegistered){ 3 ye  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x-e6[_F  
  bRegistered=FALSE; Lm=;Y6'`N  
 } X fqhD&g  
 cMask=mask; fP V n;  
 cKey=key; U3N9O.VC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n{i,`oQ"  
 return bRegistered; *67K_<bp]  
} T4HJy|  
t:5-Ro  
  四、小结 #,u|*O:  
z V\+za,  
  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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